Finding Missing Values Mean

Find the Missing Value that would make the mean of the data set 25

• 22

• 23

• 24

• 26

Gizeth’s test scores are 86, 70, 72, 100, 96, and 80. Which score must Gizeth earn on her next test to have a mean grade of exactly 85?

• 91

• 88

• 85

• 84

Paulo got these grades in three tests: 72, 80 and 82. He had one more test to take. He wanted an average of 80 for the four tests. What mark must he get in the fourth test?

• 80

• 234

• It is not possible for him to get an 80 average

• 86

If the mean of a data set is 10, what is the missing piece of data? 
5, 4, 7, 15, 12, ___

• 7

• 17

• 20

• 16

Find x if 5, 9, 11, 12, 13, 14, 17 and x have a mean of 12.

• 15

• 16

• 17

• 18

Mean: 5.95

Find the missing value: 8.7, 5.22, x, 0

• 9.88

• 9

• 5.5

• 8.25

Jamal scored 62, 75, 76, and 90 on four tests. What does he need to score on the fifth test in order to have a mean of exactly 80?

• 80

• 100

• 93

• 97

The heights of six students in a class are given below:
158cm     172cm      164cm
164cm     167cm      159cm
 However, there were actually seven students in the class, and the mean height in the class was 165 cm. What was the height of the unknown student?

• 164 cm

• 166 cm

• 171 cm

• 169 cm

In an arboretum, the heights of five trees were 21 feet, 31 feet, 36 feet, and 28 feet. What would be the height of the sixth tree if the mean height of the six trees was 28 feet?

• 24 feet

• 20 feet

• 34 feet

• 28 feet

The mean weight of 8 girls in a group is 35 kg. The individual weights of seven of them are 35kg, 28kg, 43kg, 25kg, 33kg, 51kg, and 22kg. Find the weight of the 8th girl.

• 39 kg

• 41 kg

• 43 kg

• 45 kg