Question

2a. The number of overtime hours per week worked by employees at a factory are as follows:
31 40 20 35 21 12 11 39 16 0 28 49 29 32 17 2 12 24 14 1 10 23 19 13 26 30 10 21 18 0 15 11 29 8 12 1
Use equal class intervals starting 0-9, 10-19, 20-29 and so on, calculate the standard deviation.
b. A group of 150 students were asked by a researcher the sport each of them like best. The table below shows their responses.
Sports
Number of students
Football
55
Swimming
10
Volley ball
15
Tennis
30
Hockey
40
Represent the data on a pie chart

c. Calculate the:
i. Interquartile range
ii. Variance of the following set of marks
3, 3, 1, 2, 4, 6, 2, 2, 4, 3

Answer 1

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