Find the average of all prime numbers between 60 and 90.

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74.7

73.6

answer is B.

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Detailed Solution

The prime numbers between 60 and 90 are 61,67,71,73,79,83,89.
We can see that there are 7 prime numbers between 60 and 90.
The sum of all these prime numbers = 61+67+71+73+79+83+89 = 523
The average value

= \frac{523}{7}

= 74.7

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