Statistics and probability

Question 1 of 10

A fair die is thrown once. What is the probability of getting a number greater than 4?

Question 2 of 10

The mean of 3, x, 7 and 10 is 6. Find x.

Question 3 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 4 of 10

The variance of 2, 4, 6, 8, 10 is

Question 5 of 10

The probability that A hits a target is 2/3 and B is 3/4. Both fire once independently. Find the probability that the target is hit at least once.

Question 6 of 10

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

Question 7 of 10

The median of 11, 14, 9, 20, 16, 13 is

Question 8 of 10

Find the median of 3, 8, 5, 10, 7, 2.

Question 9 of 10

Find the mean of the distribution: x = 1, 2, 3 with frequencies 2, 3, 5.

Question 10 of 10

Find the standard deviation of 2, 4, 6, 8, 10.