Statistics

What is the median of the data set: 12, 15, 18, 22, 25?

If the mean of five numbers is 20 and four of the numbers are 18, 22, 20, and 16, what is the fifth number?

The mode of the data set 5, 7, 7, 9, 10, 7, 12 is:

A frequency distribution table has class intervals 10-20, 20-30, 30-40, 40-50 with frequencies 5, 8, 12, 5 respectively. What is the total number of observations?

Find the mean of the following data: Marks: 10, 20, 30, 40; Frequency: 2, 3, 5, 10.

If the median of the data set 3, 7, x, 15, 18 is 10, find the value of x.

In a grouped frequency distribution, the class intervals are 0-10, 10-20, 20-30, 30-40, 40-50 with frequencies 3, 7, 12, 8, 5. What is the modal class?

Calculate the mean from the following frequency distribution: Class intervals: 0-5, 5-10, 10-15, 15-20; Frequencies: 4, 6, 5, 5.

The cumulative frequency just greater than or equal to 20 in the data set is 25. What is the median if the total frequency is 50?

Given the following data: Class intervals: 0-10, 10-20, 20-30, 30-40; Frequencies: 5, 8, 12, 5. Find the median class and calculate the median.