The mean of 1, 3, 5, 7 and x is 4. Find the value of x

Calculate the variance 2, 3, 3, 4, 5, 5, 5, 7, 7 and 9

The table gives the distribution of marks obtained by a number of pupils in a class test.

The table gives the distribution of marks obtained by a number of pupils in a class test. 

The bar chart show the statistics of the number of passes in an examination in a school from 2001 to 2004. What is the ratio of the total number of passes to the total number of failures

The average age of a group of 25 girls is 10 years. If one girl aged 12 years and 4 months joins the group, find, correct to one decimal place, the new average age of the group.

Find the mean of the numbers 1, 3, 4, 8, 8, 4 and 7

Calculate the mean deviation of 5, 3, 0, 7, 2, 1

Which of the following is used to determine the mode of a grouped data?

The table shows the distribution of the scores of some students in a test. Calculate the mean score.