Mean Median Mode Missing Values

The mean of 6 numbers is 5.5. The first five numbers are 2, 5, 6 , 7, 8. Find the sixth number.

• 2

• 4

• 5.5

• 5

The mean of four numbers is 12.25. The first three numbers are 16, 12, and 11. Find the fourth number.

• 10

• 9

• 11

• 16

The mean of seven numbers is 7. The first six numbers are 2 , 3, 6 , 8, 9, and 10. Find the 7th number.

• 18

• 11

• 7

• 13

The mean of five numbers is 26. The first four numbers are 10, 20, 30, and 20. Find the 5th number.

• 26

• 35

• 50

• 18

Amy’s current grades for her assignments in math class are 85, 90, 95, and 80. What grade does she have to earn on her next assignment to attain an average of 90? 

• 88
• 90
• 95
• 100

Betsy has scored a 94, 80, 89, 91 and 90 on her math tests. What must Betsy score on her next test to have a mean of exactly 90? 

• 96
• 91
• 90
• 89

Terry scored 71, 80, and 86 on his first three history tests. What must Terry score on the fourth test to have a mean of exactly 80? 

• 80
• 83
• 85
• 88

How do you find the mean?

• the number that occurs the most
• the number that is in the middle
• subtract the largest number and the smallest number in the data set
• add the numbers in the data set and then divide by how many numbers are in the data set

How do you find the range?

• the number that occurs the most

• the number that is in the middle

• largest number minus the smallest number

• add the numbers in the data set and then divide by how many numbers are in the data set

What is the mode?

• # happening the most
• the average
• biggest - smallest
• the middle #