The masses of a group of children are 9, 11, 13, 13, 15, 15, 15, a, 18, 20. Given that the median mass is 0.4 greater than the mean mass, find a.

The age of people as follows: 18, 12, 10, 16, 19, 15, 13, 10. Find the median of the given data.

the median of the data 13, 12, 14, 13, 15, 16, 18, is _______.

Find the median of the data : 21, 15, 6, 25, 18, 13, 20, 9, 8, 12

Find the sum of digits of range of data : 13, 18, 20, 15, 12, 17, 9, 14, 11 and 16

In the data 18, 13, 15, 13, 18, 14, 15, 13, 14, 15, how many times the number '15' repeats itself?

The mean deviation from mean for the data : 13,15,16,15,18,15,14,18,17,10 is

Mean of 12, 13, 18, 17, x, 10, 15 is 15 then x=______

What is the mean of 3, 5, 7, 9, 11, 13, 15?

The marks of 20 students in a test were as follows: 5, 6, 8, 9, 10, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20. Calculate the mean, median and mode.