Find the standard deviation of 30,80,60,70,20,40,50 using the direct method.

If the standard deviation of 3,8,6,10,12,9,11,10,12,7 is 2.71 , then the standard deviation of 30, 80,60,100,120,90,110,100,120 , 70 is

Find out standard deviation of the following data, using direct method:

If the standard deviation of 3, 8, 6, 10, 12, 9, 11, 10, 12, 7 is 2.71, then the standard deviation of 30, 80, 60, 100, 120, 90, 110, 100, 120, 70 is

Find the standard deviation by using 20 as assumed mean.

Find the standard deviation for the following data: 10, 20, 30, 40, 50, 60, 70, 80, 90

Range of data : 20,40,30,60,80,100,10,70 is

Find the mean, and standard deviation for the following data: (i) Year render: 10 20 30 40 50 60 No. of persons (cumulative): 15 32 51 78 97 109

Find the standard deviation of the following set of numbers: 25, 50, 45, 30, 70, 42, 36, 48, 34, 50

Using step deviation method find the standard deviation and its coeficient of the following data.Class 20-30,40-50,50-60,60-70,70-80,80-90 and Frequency 3,61,132,153,140,51,2