Core Mathematics

Question 1

1A small standard deviation means the data are

Easy

A. all negative B. all equal to zero C. spread far from the mean D. close to the mean

Question 2

2Adding a constant to every value changes the variance.

Medium

A. True B. False

Question 3

3Find the mean of 6, 9, 12.

Easy

A. 8 B. 9 C. 12 D. 10

Question 4

4The range of the data 27, 33, 16, 28 is ___.

Easy

Your answer (fill in the blank)

Question 5

5Find the variance of 1, 3, 5, 7.

Hard

A. 2.24 B. 20 C. 5 D. 2.5

Question 6

6Find the mean of -1, 5, 11.

Easy

A. 6 B. 11 C. 4 D. 5

Question 7

7Variance is measured in

Medium

A. percentages only B. degrees C. the same units as the data D. the square of the units of the data

Question 8

8Find the variance of 2, 6, 8, 12.

Hard

A. 52 B. 6.5 C. 13 D. 3.61

Question 9

9Find the standard deviation of 7, 10, 13, correct to 2 decimal places.

Hard

A. 6 B. 3.45 C. 4.24 D. 2.45

Question 10

10Standard deviation can be negative.

Easy

A. True B. False