Standard Deviation

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The mean of 5 observations is 4.8 and the variance is 6.56. If three of the five observations are 1, 3 and 8, find the other two observations

Compute variance and standard deviation for the following data:

X	2	4	6	8	10	12	14	16	18	20
F	8	10	10	7	6	4	3	4	2	6

Answer the following :

Compute the variance and S.D. for the following data:

X	62	30	64	47	63	46	35	28	60
F	5	8	3	4	5	7	8	3	7

Find variance and S.D. for the following set of numbers:

7, 11, 2, 4, 9, 6, 3, 7, 11, 2, 5, 8, 3, 6, 8, 8, 2, 6

Compute the variance and S.D.

X	31	32	33	34	35	36	37
Frequency	15	12	10	8	9	10	6

Select the correct option from the given alternatives :

If the S.D. of first n natural numbers is `sqrt(2)`, then the value of n must be ––––––.

Select the correct option from the given alternatives :

The positive square root of the mean of the squares of the deviations of observations from their mean is called:

Select the correct option from the given alternatives :

The standard deviation of a distribution divided by the mean of the distribution and expressing in percentage is called: