New Mean

A set of 4 numbers has a mean of 10. If you add the number 15 to the set, what will be the new mean?

A set of 3 numbers has a mean of 22. If you add the number 34 to the set, what will be the new mean?

The mean of four numbers is 20. If a new number, 40, is added to the set, what will be the new mean?

A set of three numbers has a mean of 8. If the number 4 is removed, what is the new mean of the remaining numbers?

You have a game where you can draw one card from a standard deck of 52 cards. If you draw a heart, you win $5; otherwise, you win nothing. What is the expected value of your winnings?

• $1.25

• $5

• $0.96

• $0

The number of points in the first five games of the football season are listed below. What is the mean number of points scored?

Mathematical Equivalence

ON

Find the mean of the countries' research and development spending.

• 21.86 billion

• 218.6 billion

• 3.5 billion

• 79.1 billion

A set of five numbers has a mean of 6. If the number 2 is removed, what is the new mean of the remaining numbers?

A set of seven numbers has a mean of 9. If the number 15 is removed, what is the new mean of the remaining numbers?

A set of 8 numbers has a mean of 15. If you add the number 60 to the set, what will be the new mean?