Statistics

What is the median of the data set: 12, 15, 18, 20, 22?

The mean of five numbers is 20. If one number is 30, what is the sum of the other four numbers?

A frequency distribution table has class intervals 10-20, 20-30, 30-40 with frequencies 5, 8, 7 respectively. What is the total frequency?

Which of the following is a measure of central tendency?

The mode of the data set 4, 7, 7, 9, 10, 7, 12 is:

If the mean of the numbers 3, x, 7, 10 is 8, find the value of x.

Find the range of the data: 45, 67, 89, 34, 56, 78.

A class interval is 20-30. What is the class mark?

In a grouped frequency distribution, the class 40-50 has frequency 12. What is the cumulative frequency up to this class if previous classes have frequencies 8 and 10?

The mean of a data set is 15 and the sum of observations is 180. How many observations are there?