Brain Time.

The mean of a set is 10.2. What is the missing value?

8, 9, x, 11, 13

• 15

• 10

• 11

• 12

• Figure (a)

• Figure (b)

• Figure (c)

• Figure (d)

Fill in the blanks; 4, 6, 12, 14, 28, 30, (?)

• 62

• 64

• 60

• 32

How many months have 30 days?

• 2 months

• 4 months

• 11 months

• 12 months

• Figure (a)

• Figure (b)

• Figure (c)

• Figure (d)

What does variance measure?

• The standard deviation.
  

• How far a set of numbers are spread out from their mean.

• How far the mean, median and mode vary from each other.

• The difference between the lowest and highest scores of a distribution.

• Figure (d)

• Figure (c)

• Figure (b)

• Figure (a)

In a drawer you have black socks and white socks. They are not stored away in pairs. Without looking, how many times will you have to reach into the drawer to come out with a matching pair?

• 1

• 2

• 3

• 4

You are 9 years old and your dad is 47. How old will your dad be when you are 21?

• 56

• 57

• 58

• 59

How do you calculate the coefficient of variation?

• You divide the standard deviation by the mean.

• You divide the standard deviation by the median.

• You multiply the standard deviation by the median.

• You multiply the standard deviation by the mean.