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 per student when 2 marks are deducted from the marks of each student.

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.

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

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.

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

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.

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

The marks obtained by 35 students of class IX of a school are given as below: 17,9,11,9,15,11,4,22,1,17,24,3,11,20,12,9,7,0,5,3,5,13,21,13,15,20,24,1,7,21,22,10,13,18,24. present the data in the form of a frequency distributions, using same class size, starting with class 0-5