Answered: The times taken (to the nearest second)…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

The times taken (to the nearest second) by 108 athletes to run a race is given in the table below:

Time (Seconds)	Number of Athletes
50-54	8
55-59	28
60-64	34
65-69	18
70-74	10
75-79	8
80-84	2

(a) State the actual limits between which the times in the class 50-54 lie.

(b) Construct the cumulative frequency distribution and draw the cumulative frequency curve.

(c) Use your curve to estimate

(i) the median,

(ii) the interquartile range.

(d) Draw a box and whisker plot and comment on the skewness of the distribution.

(e) Find the mean and variance.

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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