Average Mean

What is the formula to calculate the average of a set of numbers?

• Average = (Sum of all numbers) - (Total quantity of numbers)

• Average = (Sum of all numbers) + (Total quantity of numbers)

• Average = (Sum of all numbers) ÷ (Total quantity of numbers)

• Average = (Sum of all numbers) × (Total quantity of numbers)

Calculate the average of the numbers: 5, 10, 15, 20, 25.

• 10

• 22

• 18

• 15

If the average of a set of numbers is 12, and there are 5 numbers in the set, what is the total sum of the numbers?

• 48

• 60

• 72

• 84

True or False: The average is affected by extreme values in a dataset.

• Rarely

• Sometimes

• False

• True

Find the average of the numbers: 8, 12, 16, 20, 24, 28.

• 15

• 18

• 30

• 22

If the average of a set of numbers is 18, and one number is removed from the set, will the average increase, decrease, or remain the same?

• decrease

• remain the same

• it depends...

• increase

What is the average of the numbers: 3, 3, 3, 3, 3, 3, 3, 3, 3, 30?

• 5

• 15

• 10

• 6

How does adding a very large number to a dataset of smaller numbers affect the average?

• The average will increase.

• The average will decrease.

• The average will become negative.

• The average will remain the same.

If the average of a set of numbers is 25, and the sum of the numbers is 100, how many numbers are in the set?

• 5

• 3

• 4

• 6

The average mark for the 4 subjects is 74 marks.
How many marks did this student score for Maths?

• 74 marks

• 79 marks

• 81 marks

• 89 marks