Question a b

Estimate the standard deviation and coefficient of variance from the data below: (a) Weight 160-162 163-165 166-168 169-171 172-174 in 1b No of 15 54 26 18 24 men (5 marks) (b) In experiment, 40 laboratory mice were tested on their capability in finishing an obstacle course. The time (in seconds) taken for each mouse is as shown: 15 57 25 29 37 26 54 21 37 51 33 35 26 18 39 36 30 67 19 36 45 42 27 42 56 23 34 35 63 16 22 31 43 32 13 53 28 31 35 46 I. Construct a frequency distribution table with the class size of 10 seconds, the first class being 10-19. (3 marks) II. By using your table in (a), calculate the variance. (2 marks)