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Quick question. If you have a given sample of unknown size, and unknown distribution, but you know the following:

1 - 90th percentile equals 10

2 - There are three observations that are 10 or greater

Is it correct to assume there are 30 observations in that sample?

Now what if I add the following data:

3 - The mean is 7

4 - The median is 6

5 - The standard deviation is 2

This was a question on our last test, and I was just curious about it.

Thanks!