# cumulative frequency corbett maths

Draw a box plot to represent this same information. Amount spent, £x 50 100 150 200 o < x s 250 0' X' 300 Cumulative f 30 80 100 112 120 (a) On the grid, draw a cumulative frequency diagram. Calculating the cumulative frequency is just adding up the frequencies as you go along. If we go up the y-axis and locate the 36th value, go across to the line and then down, we can see that is corresponds to a value of 3.2 hours. Once we have plotted all the points, we need to join them together with a smooth line, with an end result similar to the below: b)  The interquartile range is calculated by subtracting the lower quartile from the upper quartile. Cumulative Frequency Graphs Videos 153 and 154 on www.corbettmaths.com *There are templates for each table and graph at the end of this exercise Question 1: The table shows information about the lengths of a type of Fish caught in a lake (a) Complete the cumulative frequency table (b) Draw a cumulative frequency graph for your table. To find the median, we need to read the value of the car that corresponds to a cumulative frequency total of 24 (half of 48). Graphs: cumulative frequency (draw) Video 153 Graphs: cumulative frequency (interpret) Video 154 Maths Genie keyboard_arrow_up Video questions. The upper class boundaries for this table are 35, 40, 45, 50 and 55. Because of the word ‘than’, it is the length of the snakes at Bob Exotic’s Snake Sanctuary that we should consider as the ‘original’ value. Therefore the remaining cars must have a value which is greater than £17,500. Videos. Our list was 3, 3, 5, 6, 6, 6, 8. b) Using the data from your table, plot a cumulative frequency graph on the axes below. The Corbettmaths Practice Questions on Relative Frequency. The first value is the first frequency value, we then add this to the second value to get the second cumulative frequency value. (c) How many cars exceeded the speed limit? The next box is the £0 - £15,000 box. The speed limit on the road is 85 km/h. Covers all aspects of the GCSE 9-1 syllabus. The guideline for median, lower … 1 The cumulative frequency table shows the height, in cm, of some tomato plants. If at the other snake sanctuary, the median snake length is 1.78 metres, then to calculate how much smaller as a percentage, we need to find out how much smaller the median snake is: To work out a percentage increase or decrease, you need to remember the simply formula: (In this question, however, it may not be obvious what the original value is. Cumulative frequency is the number of times that anything up to and including that value (or group of values) appeared. The length of the 120th snake is approximately 3.5 metres. gcse questions. Since there are 48 cars in total then the number of cars which have a value of more than £17,500 is simply 48-26=22 cars. Welcome to Corbettmaths! Whenever you wish to find out the popularity of a certain type of data, or the likelihood that a given event will fall within certain frequency distribution, a cumulative frequency … graph is straightforward as long as the median and quartiles have been found. From the graph, we can see that the minimum number of hours was 0 and the maximum was 12. 1. Download all files (zip) GCSE-CumulativeFrequencyAndBoxPlots.pptx ; The median value is the middle value. KS2/3/4:: Data Handling & Probability:: Data Representation. These are the Corbettmaths Textbook Exercise answers to Cumulative Frequency Graphs By locating the value of 24 on the cumulative frequency axis, we can see that this corresponds to a value of approximately £16,000. The Corbettmaths Videos on Drawing Cumulative Frequency Graphs and also Reading Cumulative Frequency Graphs Corbettmaths Videos, worksheets, 5-a … b)  For the cumulative frequency diagram, we need to plot the time in minutes along the x-axis and your cumulative frequency totals on the y-axis. ��gn��F$Z�s�me�9����+��}�$�8�䓔���A#T�@��Ts��-ue�ե�BGVp�!�J�e?�4��\J�F�US]��Ob��%Bj�+ho�׬��r4uI75~k�b���l��2e���V������T5�d��M]J�x��3�Y*�!�������ΐ U��LIo�h�a9���X�݅I%�7J�q]��K�Y$��mBR�K��LQh-b�1��)b֤�i�kzH��f�!ʛ=�Hh���J�M{��?��C)c�S��Jd@ܐ����M����^��S�t��LT����hh���:����DH�Ȃ�u���k�2q0����qFJ km/h (1) 26 (2) (2) 10 20 30 40 50 60 (a) Estimate the median speed. Choose the settings shown here. Using this information, the resulting box plot will look like this: Question 3: The below table shows the number of cars at a showroom and the price brackets that they fall in to: a) Complete the cumulative frequency table, and draw a cumulative frequency graph to represent this data: b) the approximate median price of a second-hand car, c) an estimate for how many cars cost more than £17,500. Question 1: Below is a frequency table of data showing the amount of time people spent on a particular website in one day. (Total for question 1 is 3 marks) Height Cumulative Frequency 140 < h 150 7 140 < h 160 17 140 < h 170 32 140 < h 180 51 140 < h 190 57 140 < h 200 60 (a) On the grid, plot a cumulative frequency graph for this information. For the third cumulative frequency box, we need to add 19 to the 40 from the previous cumulative frequency box. Therefore the interquartile ranges is 2 metres. Your completed cumulative frequency graph should look as follows: b) We know that there are 48 cars in the showroom in total (since the maximum value on the cumulative frequency table is 48). GCSE Cumulative Frequency Graphs, Box Plots and Quartiles. stream Corbettmaths - This video is on relative frequency / experimental probability. Videos, worksheets, 5-a-day and much more You should join up the plotted points with a smooth curve. For the third cumulative frequency box, we need to add 19 to the 40 from the previous cumulative frequency box. The final cumulative frequency should equal the total number of data points in your set. The question asks us to work out by what percentage these snakes are smaller than the snakes in Bob Exotic’s Snake Sanctuary. The points plotted on your graph should be plotted at the end of each class. Since there are 72 values in total, then the median value is the 36th value (since 36 is half of 72). Videos, worksheets, 5-a-day and much more For the second cumulative frequency box, we need to add 24 to the 16 from the previous cumulative frequency box. come with answers. How accurate was the estimate? The below table shows this information: a) Draw a cumulative frequency graph for this information on the axes below. The upper quartile is half-way between the final value and the median values. To find the length of the 120th snake, find 120 on the vertical cumulative frequency axis and find the corresponding length on the horizonal axis. Set up Plot 3 to display a boxplot of the frequency data in L2 and L3 on the same graphing screen. Cumulative Frequency and Box Plots. the cumulative frequency graph in Activity 5. frequency tables Cumulative frequency is a running total of the frequencies. It should end up looking like an elongated ‘S’ shape. arrow_back Back to Cumulative Frequency Diagrams Cumulative Frequency Diagrams: Worksheets with Answers. (b) Find the median height. This is shown on the cumulative frequency graph below. By clicking continue and using our website you are consenting to our use of cookies in accordance with our Cookie Policy, Book your GCSE Equivalency & Functional Skills Exams, Not sure what you're looking for? This process of adding the frequency total to the cumulative frequency total repeats until the table is complete. a) We know that there are 8 cars with a value between £0 and £10,000[/latex], so we can insert 8 in the £0 - £10,000 cumulative frequency box. Since there are 160 snakes in total, the median snake length is the length of the 80th snake (80 because 80 is \frac{1}{2} of 160. Then we need to plot each of the cumulative frequency figures with the corresponding class interval maximums. advanced charts and graphs > revision > gcse questions. This carefully selected compilation of exam questions has fully-worked solutions designed for students to go through at home, saving valuable time in class. The lower quartile is half-way between the first value and the median. www.justmaths.co.uk Cumulative Frequency (H) - Version 2 January 2016 Cumulative Frequency (H) A collection of 9-1 Maths GCSE Sample and Specimen questions from AQA, OCR, Pearson-Edexcel and WJEC Eduqas. This is the Corbettmaths video tutorial on Drawing Cumulative Frequency Graphs (b) Find the percentage of mice that weigh 70 grams or less. By drawing a line up from £17,500 until it touches the line and then drawing a horizontal line to the y-axis, we should hit a cumulative frequency total of approximately 26. We know that there are 8 cars with a value of less than £10,000, and a further 12 cars which have a value of more than £10,000 but less than £15,000, therefore 20 cars have a value of between £0 and £15,000, so this is the next value we can insert. (a) Write down the median weight of the mice. To work out which value is the upper quartile, simply find \frac{3}{4} of the total number of values: The upper quartile is therefore the value of the 54th term. The cumulative frequency table shows this information. %äüöß Contents. a) Complete the cumulative frequency column in the table above. Author: Created by Maths4Everyone. �>�}K�.�N�0�FT���-�O��^x� ;�]��;��Qg��]W�.�-zn �g�N)����S�FD[�ܵq�?���1H�;��hO.k�A�C�Wc;-9M��Yy����@�X"���!~�xOzR�p��(09�O�LJmr`BT�sZq*�3�KBS=��� v?訕&�Y�Y'4����ȍ*���n^Ʃ4y�mm&�mZ�6[͜���r�a��P3Z"d���H��͆͘�1������B�p�x��)6��N*q�at97��t��Ô�'VV. So, the first point we plot (after plotting (0,0), the origin) would be the cumulative frequency total of 8 against £10,000 (the top value in the £0 - £10,000 band). Step 1: Construct a cumulative frequency table for this data. 120 80 40 20 0 50 100 150 200 250 300 Amount spent (2) CORBETTMATHS 2014 The cumulative frequency diagram shows the distribution of speeds for 60 cars on a road. Count the number of data points. We have a range of learning resources to compliment our website content perfectly. i.e. The same data is presented in the following table. Home to 1000's of maths resources: Videos, Worksheets, 5-a-day, Revision Cards and much more. %PDF-1.4 Using the cumulative frequency graph below, calculate the median and interquartile range. In this data set, the upper quartile is the length of the 120th snake (120 because 120 is \frac{3}{4} of 160. KS2/3/4:: Data Handling & Probability:: Averages and Range. If we go up the y-axis and locate the 18th value, go across to the line and then down, we can see that is corresponds to a value of 1.6 hours. (A cumulative frequency graph is always a smooth curve which goes up.). Corbettmaths - This video explains how to draw and also read a box plots (box and whisker diagram). There are 7 items, which is our final cumulative frequency. Find the upper and lower quartiles. This can be represented on a graph by plotting the upper boundary of the groups. Created: Oct 17, 2017 | Updated: Jan 17, 2019. For the second cumulative frequency box, we need to add 24 to the 16 from the previous cumulative frequency box. View all Products, Not sure what you're looking for? !and a maximum salary of £48,000.! <> The first cumulative frequency box is simply the number 16. Cumulative Frequency Graph, Plot the cumulative frequency curve. The times taken by customer service operators to answer 120 telephone calls are illustrated in the cumulative frequency diagram shown below. GCSE 9-1 Exam Question Practice (Cumulative Frequency) 4.9 34 customer reviews. In other words, for the time interval of 0 - 20 minutes, you would go along the x-axis to 20 minutes (the maximum in this time range) and go upwards to the cumulative frequency value of 16. Q_1 = 163, \,\, \text{ median } = 170, \,\,Q_3 = 176. Question 2: Shown below is a cumulative frequency graph showing the number of hours per week people spent exercising. Fully differentiated lesson on cumulative frequency graphs and box plots. Continue this process until all values are calculated and your cumulative frequency table should look as follows: To draw the graph, we need to plot the cumulative frequency totals on the vertical axis (the cumulative frequency is always on the y-axis and the price in pounds on the x-axis. ��e2�G>k 19+40=59 Corbettmaths - This video explains how to compare box plots (box and whisker diagrams). Read our guide, 2.6\text{ m } – 1.78\text{ m} = 0.82\text{ m}, \dfrac{ \text{ difference}}{\text{ original value}}\times 100, \dfrac{0.82\text{ m}}{2.6\text{ m}}\times 100=31.5\%. Visit his excellent website for more videos, textbook exercises, exam questions, 5-a-day, and more! *_���$r��oŗwl�2�x��~1���^P�YP���1�:߾�|��6"��Iϟ�9�K��X|��5ky��|��X�|���jqN��T톟kY��w��; �����p������+A�wз^.�v�|E�!��C2��Z~�r 60 Cumulative 50 frequency 30 20 10 70 80 90 Speed. If we go up the y-axis and locate the 54th value, go across to the line and then down, we can see that is corresponds to a value of 5 hours. The weights in grams of 98 mice are shown in the cumulative frequency diagram. Words / phrases like ‘compared to’ or ‘than’ always indicate what we are working out a percentage of.). !The 60 mathematics graduates ! 2 0 obj c)  For this question, we need to locate £17,500 on the x-axis and see what cumulative frequency total this corresponds to. In this data set, the lower quartile is the length of the 40th snake (40 because 40 is \frac{1}{4} of 160. After plotting our first point of (0,0), the next point is (1,23); the key thing to remember is that since the snake length data is grouped, we need to plot the highest value in each length band (so for the 0 metres – 1 metre band, we would plot the corresponding cumulative frequency total against 1 metre). A cumulative frequency diagram is drawn by plotting the upper class boundary with the cumulative frequency. And best of all they all (well, most!) c)  In another snake sanctuary in the same country, the median length of their snakes is 1.78m. To work out which value is the lower quartile, find \frac{1}{4} of the total number of values: The lower quartile is therefore the value of the 18th term. Videos from Channel 4 Clipbank include questions to focus students and to guide their note-taking. Preview. We can also see from the graph that is represents exercising data from 72 people since this is where the graph ends. Mathster; Corbett Maths These videos are made by Corbett Maths. c)  For this question, we need to work out the median snake length at Bob Exotic’s Snake Sanctuary. There are two ways to check this: Add all the individual frequencies together: 2 + 1 + 3 + 1 = 7, which is our final cumulative frequency. The Corbettmaths Textbook Exercise on Cumulative Frequency Diagrams. 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