The mean of ten positive numbers is 16. When another number is added, the mean...

Mathematics

JAMB 2021

The mean of ten positive numbers is 16. When another number is added, the mean becomes 18. Find the eleventh number

A. 3
B. 16
C. 38
D. 30

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Correct Answer: Option C

Explanation

Mean of 10 numbers = 16

The total sum of numbers = 16 x 10 = 160

Mean of 11 numbers = 18

Total sum of numbers = 11 x 18

= 198

The 11th no. = 198 - 160

= 38

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The mean of ten positive numbers is 16. When another number is added, the mean...

Correct Answer: Option C

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