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The mean of the five numbers 6, 9, 13, $x$ and 17 is 12. Find the value of $x$ .

Competition practiceData & Probability

A12
B15
C18
D14

Step-by-Step Solution

Sum of the five numbers =

5 \times 12 = 60

. The four known values add to 6 + 9 + 13 + 17 = 45, so

x = 60 - 45 = 15

.

Answer: B) 15

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