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Five students wrote a test and four of the marks were 70, 78, 84, and 90. If the median was 78, what is the highest possible average(mean)?

A) 84.4

B) 78

C) 81

D) 79.8

E) 80

 Apr 11, 2020
 #1
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The ordering will go: ?, 70, 78, 84, 90.

The largest possible mean will be when the ? is the largest.


The largest possible value for ? is 78.

So, 70+78+78+84+90=400.

And 400/5=80.

 

So, our answer is 80, or E.

 Apr 11, 2020

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