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1. Calculate the mean and standard deviation of the following distribution:

Age (Years): 25-30 30-35 35-40 40-35 45-50 5O-55

No of workers: 70 51 47 31 29 22

2. (a) Your are supplied the following data about height of boys and girls in a college:

Boys

Number

Average He/gl,t

68"

Variance

Girls

61"

You are required to find out (i) the combined mean and S.D. of heights of boys and girls taken together, and show (ii) whose height is more variable?

(b) Find mean deviation and its coefficient of the following series:

Size	1O	1 1	12	13	14
Frequency :	5	12	18	12	3

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91604153

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