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Given that 9, 12, 15, 18 and $x$ have a mean of 14,
first find $x$ , then state the largest number in the data set.

Class 7Arithmetic MeanData Handling

A18
B16
C15
D14

Step-by-Step Solution

Sum =

14 \times 5 = 70

. So

9 + 12 + 15 + 18 + x = 70

, i.e.

54 + x = 70, x = 16

. The largest value in {9,12,15,18,16} is 18.

Answer: A) 18

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