If in a moderately skewed distribution the value of mode and mean are 6 λ  and 9λ  respectively, then the value of the median is  ______.

If in a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately?

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

The mean deviation from the observations  3, 8, 12, 19, 20 is

Geometric means of 2, 2², 2³, . . . . . 2ⁿ  is 

Find the mean age from the following  data
Age ( Years ) :          20 - 30    30 - 40    40 - 50   50 - 60    60 - 70
Number of person :   3                 5             22          30          2         is 

The arithmetic mean of n number  of a series is  .  If the sum of first ( n - 1 ) number  is K then the n^th number is

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

The mean of 5 numbers is 18. If one  number  is excluded, their  mean becomes 16, then the excluded number is

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