A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, 19 and 20 years. One student is selected in such a manner that each has the same chance of being chosen and the age X of the selected student is recorded.

A class has 15 students whose ages are 14,17,15,14,21,17,19,20,16,18,20,17,16,19 and 20 yr. One students is selected in such a manner that each has the same chance of being of chosen and the age X of the selected stuydent is recorded. Mean variance and standard deiation (SD) of X,are respectvely

20,20, 19, 16, 17, 13, 14, 11 ?, ?

Find the range of the data : 14, 15, 16, 18, 19, 25, 30, 41, 26, 16, 13, 18, 20 and 26.

19.2, 20.6, 17.6, 22.4, 16, 24, 14.4

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

Mode of the data 15,17,19,14,18,15,14,20,19,14,15,19,14 is

The marks of 15 students (out of 50) in an examination are 20, 22, 26, 31, 40, 19, 17, 19, 25, 29, 23, 17, 24, 21, 35 Find the median marks

the range of the data 13, 18, 20, 15, 12, 17, 9, 14, 11, and 16 is ________.