88,70,84,72, what does the fifth number have to be for the mean to equal 80?

find the mean score of 88,70,84,and 72, and what  is the fifth number equal if the mean equals 80?
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1 Answer

The number is 86. The mean is the average. The sum of 5 numbers to get an average of 80 is 400. The sum of the 4 numbers given is 314. So, 400 minus 314 is 86.
by Level 1 User (200 points)

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