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Find the mean deviation about the median of 13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17.

Competition practiceStatistics

A2.55
B2.33
C2.5
D0.5

Step-by-Step Solution

Ordered: 10, 11, 11, 12, 13, 13, 14, 16, 16, 17, 17, 18; median

= \frac{13 + 14}{2} = 13.5

. Sum of

∣ x - 13.5∣ = 28

; MD

= 28 \div 12 \approx 2.33

.

Answer: B) 2.33

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