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MATHEMATICS

JAMB 2021 - Question 23

Mathematics 2021 JAMB Past Questions - Question 23: The mean of ten positive numbers is 16. When another number is added, the mean becomes 18. Find the eleventh number

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

Explanation

Mean of 10 numbers = 16The total sum of numbers = 16 x 10 = 160Mean of 11 numbers = 18Total sum of numbers = 11 x 18= 198The 11th no. = 198 - 160= 38