The mean of ten positive numbers is 16 When ano... - JAMB Mathematics 1990 Question
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
18
D
38
correct option: d
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
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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