Find the average of all prime numbers up to 40. (Correct to 2 decimal places)
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 16.42.
All prime numbers up to 40 = 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37
So,
Average = Sum of the observation/Total observations
Average = (2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37)/12
⇒ 197/12
⇒ 16.416 = 16.42