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Last Updated on May 5, 2023
GMAT OFFICIAL GUIDE PS
Solution:
Let’s first calculate the mean (arithmetic average).
mean = sum/quantity
mean = (n + n + 1 + n + 2 + n + 4 + n + 8)/5
mean = (5n + 15)/5
mean = n + 3
Next, we determine the median. The median is the middle value when the terms are ordered from least to greatest. The terms ordered from least to greatest are as follows:
n, n + 1, n + 2, n + 4, n + 8
The median is n + 2.
Finally we are asked how much greater the mean is than the median. To determine the difference we can subtract the smaller value (the median) from the larger value (the mean) and we get:
n + 3 – (n + 2) = n + 3 – n – 2 = 1
Answer: B
