Statistics and probability

Question 1 of 10

The marks 2, 5, 5, 6, 7, 9 have a mean of

Question 2 of 10

The mean of 5, x, 8, 2x and 10 is 10. Find x.

Question 3 of 10

The mean of 5 numbers is 12. If one number is removed, the mean of the rest is 11. The removed number is

Question 4 of 10

In a frequency table, scores 1, 2, 3, 4 have frequencies 3, 5, x, 2 and the mean is 2.4. Find x.

Question 5 of 10

A bag holds 5 red, 3 green and 2 blue balls. What is the probability of picking a ball that is not green?

Question 6 of 10

The mode of 3, 5, 5, 6, 7, 7, 7, 8 is

Question 7 of 10

The mean of 5 numbers is 12. If one number is removed the mean becomes 10. The number removed is

Question 8 of 10

A number is chosen from 1 to 20. What is the probability that it is a multiple of 5?

Question 9 of 10

The weights of 5 students are 50, 55, x, 62 and 68 kg. If the mean is 58 kg, find x.

Question 10 of 10

The range of a set of numbers is 15 and the smallest is 8. What is the largest?