Finding Averages and Missing Numbers

The video tutorial explains how to solve a problem involving finding a missing value, X, in a set of numbers with a known average. It guides through setting up an equation, solving for X, and verifying the solution by recalculating the average.

What is the average of a set of numbers if the sum of the numbers is 24 and there are 4 numbers?

• 6

• 7

• 5

• 4

If the average of 3, 5, x, and 9 is 6, what is the sum of these numbers?

• 36

• 30

• 24

• 18

What operation is performed after adding all numbers to find the average?

• Add the average

• Subtract the smallest number

• Divide by the number of values

• Multiply by the number of values

How do you set up an equation to find a missing number in a set with a known average?

• Subtract the average from the sum

• Divide the sum by the average

• Multiply the average by the count and subtract known numbers

• Add all numbers and divide by the count

What is the first step in solving the equation 3 + 5 + x + 9 = 24 for x?

• Add 3, 5, and 9

• Subtract 24 from 3, 5, and 9

• Multiply 24 by 4

• Divide 24 by 4

After isolating x in the equation 3 + 5 + x + 9 = 24, what is the value of x?

• 5

• 6

• 7

• 8

In the equation 3 + 5 + x + 9 = 24, what is the sum of the known numbers?

• 15

• 18

• 17

• 16

What is the missing number if the average of 3, 5, x, and 9 is 6?

• 8

• 7

• 6

• 5

What is the equation used to find the missing number in the set 3, 5, x, 9?

• 3 + 5 + x + 9 = 6

• 3 + 5 + x + 9 = 30

• 3 + 5 + x + 9 = 24

• 3 + 5 + x + 9 = 18

How can you verify the solution to the equation by recalculating the average?

• Multiply the average by the number of values

• Subtract the average from the sum

• Divide the sum by 4 and check if it equals 6

• Add the numbers and check if the sum is 24