Mean

The mean of six numbers is 5.

Five of the numbers are 6, 6, 5, 3 and 1.

Work out the sixth number.

• 4

• 9

• 4.2

• 7

The mean of five numbers is 8.2.

Four of the numbers are 8, 10, 12 and 10.

Work out the fifth number.

• 10

• 11

• 1

• 3

Mr Holland gives his class a test. The results are: 34%, 44%, 75%, 21%, 98%, 86%, 71%, 76%, 63%, 55% How many students scored above the mean percentage?

• 4

• 5

• 6

• 7

Calculate the mean:

23, 15, 8, 12, 26, 5, 22, 9

• 17.1

• 15

• 13.3

• 12

The temperature in Springfield on this date in the last ten years were: 68, 68, 69, 70, 72, 70, 68, 75, 55, 67. What is the average temperature on this date over the last ten years? (Round to nearest whole number)

• 60

• 61

• 68

• 69

Jessica has five grades from assessments and quizzes. They are all weighted equally. If her grades are 50, 70, 88, 70, and 88, what is her current average grade?

• 71

• 72

• 73

• 74

Calculate the mean:

81, 69, 72, 80, 67, 62, 78, 74, 71, 86

• 82.2

• 92

• 67.2

• 74

Calculate the mean:

25, 36, 34, 17, 22, 31, 38

• 25.3

• 29

• 40

• 33.8

Calculate the mean:

61, 45, 52, 48, 53, 49, 57, 46, 60, 54, 58

• 49

• 53

• 64.7

• 58.3

Calculate the mean:

99, 87, 84, 91, 97, 86, 83, 90, 93

• 101.2

• 90

• 81

• 73.6