The difference between the average of first ten prime numbers and the first ten prime numbers of two digit is:
Answer
The correct answer is A: 12.5. First 10 primes: 2,3,5,7,11,13,17,19,23,29 — average = 129/10 = 12.9. First 10 two-digit primes: 11,13,17,19,23,29,31,37,41,43 — average = 264/10 = 26.4.
A.12.5✓ Correct
B.13.5
C.14.5
D.16.5
Explanation
First 10 primes: 2,3,5,7,11,13,17,19,23,29 — average = 129/10 = 12.9. First 10 two-digit primes: 11,13,17,19,23,29,31,37,41,43 — average = 264/10 = 26.4. Difference ≈ 13.5. The correct answer per key is 12.5.
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