The mean of ten positive numbers is 16. When another numb...
The mean of ten positive numbers is 16. When another number is added, the mean becomes 18. Find the eleventh number
3
16
18
32
Correct answer is 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
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