The mean of first  n - natural number is 

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 of  9 observation  is 100 and that of 6 observations is 80,  then the combined mean of all 15 observation is

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

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

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 median of the daily wages of ten   worker in Rs. 20, 25, 17, 18, 8, 15, 22, 11, 9, 14 is 

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

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