If 96 is the variance of the scores of a batsman in matches played by him. Then the standard deviation is
6.87
9.79
9.98
10.9
The median of the observations 2, 30, 12, 25, 20, 8, 10, 4, 15, Is
12
25
10
15
The mean of 5 numbers is 18. If one number is excluded, their mean becomes 16, then the excluded number is
18
26
30
Geometric means of 2, 22, 23, . . . . . 2n is
22/n
2n/2
2n
2(n+1)/2
The arithmetic mean of n number of a series is . If the sum of first ( n - 1 ) number is K then the nth number is
Find the mean age from the following data Age ( Years ) : 20 - 30 30 - 40 40 - 50 50 - 60 60 - 70Number of person : 3 5 22 30 2 is
50. 70
49 . 70
48 . 70
47. 70
The mean deviation from the observations 3, 8, 12, 19, 20 is
6.5
7.9
8.5
9.7
The marks obtained in chemistry by the 15 students of class XI B are
20, 15, 10, 20 27, 28, 27, 10, 20, 30 35, 40, 41, 41, 20 then the value of mode is
20
27
41
The variance of first n natural numbers is
If 10 is the mean of a set of 7 observation and 5 is the mean of a st of 3 observations, then the mean of the combined set is
7.5
