Question : Find the average of prime numbers lying between 69 and 92.
Option 1: 76
Option 2: 77
Option 3: 78
Option 4: 79
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Correct Answer: 79
Solution :
The prime numbers between 69 and 92 are 71, 73, 79, 83 and 89.
Average = $\frac{\text{Sum of the terms}}{\text{Number of the terms}}$
⇒ Average = $\frac{71 + 73 + 79 + 83 + 89}{5}=\frac{395}{5}= 79$
Hence, the correct answer is 79.
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