Missing Value for Mean

FInd the value of x: 72, 56, x, 77, 69 Average = 71

(a)  

FInd the value for x: 5, 14, 12, x, 10, 4 Average = 9

(a)  

FInd the value of x: x, 47, 32, 24, 22 Average = 32

(a)  

Find the value of x: 85, 79, x, 91 if the Average = 87

(a)  

Find the missing value: 11, 20, x, 7

• 18

• 14

• 15

• 19

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

• 15

• 16

• 17

• 18

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

Mean: 10

Find the missing value: 4, x, 19

(a)  

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

Katie earned 84,92,84,75 and 70 on her first 5 tests. What is the minimum grade Katie needs to earn on the next test to have a mean of 84?

• 81

• 84

• 95

• 99