alleryA grocer sold 10, 20, 30, 40, 50 and 60 kg of rice on six days. What is the mean daily sale in kg?
A30
B45
C40
D35
Answer & Solution
Correct answer: D. 35
1. Total = 10 + 20 + 30 + 40 + 50 + 60 = 210 kg.
2. Number of days = 6.
3. Mean = 210 / 6 = 35 kg.
30 and 40 are two of the middle values but not the mean of all six, and 45 is not balanced by the others.
_Source: Wikipedia, Arithmetic mean, Definition_
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