Statistics

Question 1 of 10

To estimate the mean of grouped data, each class is represented by its

Question 2 of 10

The standard deviation of a data set is 4. If each value is multiplied by 3, the new standard deviation is

Question 3 of 10

The class mark of the interval 10–19 is

Question 4 of 10

The coefficient of variation of data with mean 50 and SD 5 is

Question 5 of 10

If each value in a data set is increased by 5, the standard deviation

Question 6 of 10

The variance of 1, 3, 5 is

Question 7 of 10

The mean of 10 numbers is 15. If each number is multiplied by 2 and then 3 is added, the new mean is

Question 8 of 10

The mean of five numbers is 12. Four of them are 10, 14, 8 and 16. Find the fifth.

Question 9 of 10

The standard deviation is the

Question 10 of 10

The standard deviation of a data set is