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Standard deviation of a set of numbers is a non-negative quantity which equals (maximum number – minimum number) in the set.
Statement 1: We are given the mean of the set of numbers. We can’t find the maximum and the minimum number from this information .Hence, Insufficient.
Statement 2: It is given that all 20 coins in the jar have the same value. This means the S.D = 0.
Hence, Sufficient.
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what combinations of 20 coins equals an average of 25 without all being quarters? Seems like thats impossible to me and the answer is D.

Also do half dollars and dollar coins exist on the GMAT? Taking it sunday, would like to know before, but it probably wont come up anyways
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ayooohelp
what combinations of 20 coins equals an average of 25 without all being quarters? Seems like thats impossible to me and the answer is D.

Also do half dollars and dollar coins exist on the GMAT? Taking it sunday, would like to know before, but it probably wont come up anyways

Circulating coins exist in denominations of 1¢, 5¢, 10¢, 25¢, 50¢, and $1.00. So, there are several combinations possible to average 25¢. For example, five 5¢ and fifteen 25¢ coins would average 20 cents.
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