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Review: Average of Four Numbers
Explanation
Since the average of the numbers is 150, they could all be
150, or they could be dispersed around 150. The iron law is that the differences
between each of the numbers and 150 must all cancel out. On to the statements,
separately first.
In Statement (1), if none of the numbers is less than 150,
the only way their differences from 150 could net to zero is if all of the
numbers were 150. Therefore all of the numbers are 150, we can answer
definitively, and Statement (1) is sufficient.
Statement (2) is sufficient on the same grounds as
Statement (1).
The correct answer is (D).
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