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QOTD #2 The average (arithmetic mean) bowling score of n bo [#permalink]
02 Jul 2016, 07:15

Expert's post

00:00

Question Stats:

99% (00:39) correct
0% (00:00) wrong based on 7 sessions

The average (arithmetic mean) bowling score of n bowlers is 160. The average of these n scores together with a score of 170 is 161. What is the number of bowlers, n?

Re: QOTD #2 The average (arithmetic mean) bowling score of n bo [#permalink]
20 Mar 2018, 18:02

I'm very confused by the wording on this question. It says, "The average of these n scores together with...". It doesn't say, "The sum of these n scores together with...", but that appears to be how they write the equation. This is why I keep getting this question wrong. The average is 160 so I write the equation as follows:

(160 + 170) / (n + 1) = 161

Which is, of course, wrong. It should be:

(160n + 170) / (n + 1) = 161

Anyone have insight in to how to read this question so it lines up with the correct answer? Thanks!