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. What is the probability distribution of the random variable X ? Find the mean of X.

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. What is the probability distribution of the random variable X? Find mean, variance and standard deviation of X.

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

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

The mole of given data 15,14,19.20,14,15,16,14,15,18,14,19, 15,17 and 15 is

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