Q10 of 108 Page 32

Calculate the mean, variance and standard deviation of the following frequency distribution:

Given, The data is given in table

To Find: Find the standard deviation of the frequency


Explanation:



Now, N=70, ,


Mean






Variance = 100(3.57-1.96)


Variance = 161


Standard Deviation


SD = 12.7


Hence, The standard deviation is 12.7


More from this chapter

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8

Mean, and standard deviation of 100 observations was found to be 40 and 10 respectively. If at the time of calculation two observations were wrongly taken as 30 and 70 in place of 3 and 27 respectively, find the correct standard deviation.

 9

While calculating the mean and variance of 10 readings, a student wrongly used the reading of 52 for the correct reading 25. He obtained the mean and variance as 45 and 16 respectively. Find the correct mean and the variance.

 1

Two plants A and B of a factory show the following results about the number of workers and the wages paid to them


In which plant A or B is there greater variability in individual wages?

 2

The means and standard deviations of heights and weights of 50 students in a class are as follows:


Which shows more variability, heights or weights?