The mean of first n - natural number is
n/2
The means of the series 1, 2, 4, 8, - - - - 2n is
One of the method of determining mode is
Mode = 2 median - 3 mean
Mode = 2 median + 3 mean
Mode = 3 median - 2 mean
Mode = 3 median + 2 mean
If in a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately?
20.5
22.0
24.0
25. 5
The heights ( in cm ) of the 15 students of a class are 152, 145, 156, 149, 151, 159, 148, 160, 153, 154, 150, 143, 155,
157, 161 cm. The median of height of the student is
152 cm
149 cm
153 cm
150 cm
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
10
20
27
41
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
The median of the observations 2, 30, 12, 25, 20, 8, 10, 4, 15, Is
12
25
15
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 mean age of the combined group of men and women is 25 years. If the mean age of the group of men is 26 and
that of the women is 21, then the percentage of men and women in the group is
60, 40
80, 20
20, 80
40, 60
