Question

Find the average of prime numbers lying between 69 and 92.

• A. 76
• B. 77
• C. 78
• D. 79

Answer 1

Answer:

D. 79

Solution: Concept used: Average = S/N Where S = sum of all the numbers and N = count of numbers Calculation: Sum of prime number between 69 to 92 = 71 + 73 + 79 + 83 + 89 = 395 Average of prime number between 69 to 92 = 395/5 = 79 ∴ The correct answer is 79 Mistake Points 91 is not a prime number ⇒ 91 = 13 × 7