The marks obtained by 20 students in a test were 13, 17,11,5,18,16,11,14,13,12,18,11,9,6,8,17,21,22,,6. Find the mean marks when the marks of each student are doubled.

Find the mode of the following marks obtained by 20 students 3,5,6,9,3,2,8,8,6,4,5,10,3,5,7,9,9

The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the: Mean makrs obtained by the group.

The following data gives the marks out of 50, obtained by 11 students of a class in a test 32,23,22,18,42,18,20,17,12,9,11 Arrange them in ascending order and present it as a completed data In exclusive form.

Find the mean for the following data: 13,17,16,14,11,13,10,16,18,12,17

The range of the data: 27,18,20,16,6,17,15,12,30,32,10,19,8,11,20 is

The following data gives the marks out of 50, obtained by 25 students of a class in a test 32,23,22,18,42,18,20,17,12,9,11 Arrange them in ascending order

Find the median of the following data: 12,11,6,7,10,17,9,15,13

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.