Statistics Mock Tests

The mean deviation about the mean of the data 2, 4, 6, 8, 10 is:

The mean of the data set: 4, 8, 12, 16, 20 is:

The mode of the data: 12, 15, 12, 18, 20, 15, 12, 22, 15 is:

If the mean of 5, 10, 15, 20 and x is 12, then the value of x is:

The mean of 5 numbers is 18. If one number is excluded, the mean becomes 15. What is the excluded number?

The median of the data 12, 15, 18, 21, 24, 27, 30 is:

The variance of the first n natural numbers is:

The modal class of the following frequency distribution is: Class: 0-10 10-20 20-30 30-40 40-50 Freq: 5 8 15 7 4