The masses of a group of children are 9, 11, 13, 13, 15,15,15, a , 18, 20. Given that the median mass is 0.4 greater than the mean mass, find a
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median of this series = (15+15)/2=15
mean = (129 + a)/10
15 = (129 + a)/10 + 0.4
(129 + a)/10 = 15 - 0.4 = 14.6
129 + a = 14.6 × 10 = 146
a = 146 - 129 = 17
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