Find the average of all even numbers between 70 and 90.

77.56

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78.65

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79.777

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Solution

The correct option is C 79.777
Even numbers between 70 and 90 are 72,74,76,78,80,82,84,86, and 88
Arithmetic mean of even numbers
= (72+74+76+78+80+82+84+86+88)/9
=718/9 = 79.77
Hence, required average = 79.77

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