Statistics

The marks obtained by 5 students in a test are: 45, 50, 55, 60, 65. What is the mean of these marks?

In a frequency distribution, the class intervals are 10-20, 20-30, 30-40, and 40-50. Which of the following is the correct class mark for the interval 30-40?

The mode of the data set 3, 7, 3, 2, 9, 3, 7 is:

The median of the data 12, 15, 18, 20, 22, 25, 28 is:

A frequency distribution table shows the following classes and frequencies: 0-10 (5), 10-20 (8), 20-30 (12), 30-40 (10). What is the total frequency?

If the mean of the data set 4, 8, x, 10, 12 is 9, find the value of x.

The cumulative frequency just greater than or equal to 30 in the following data is: Class intervals: 0-10 (3), 10-20 (7), 20-30 (10), 30-40 (5).

The variance of the data set 2, 4, 6, 8, 10 is:

A grouped frequency distribution has class intervals of width 5 starting from 10. If the median lies in the class 25-30, which formula is used to calculate the median?

The coefficient of variation (CV) is defined as: