The Average of First Five Prime Numbers is GMAT Problem Solving

Question: The average of first five prime numbers is:

1. 5.1
2. 5.3
3. 5.5
4. 5.6
5. 5.7

Correct Answer: D
Solution and Explanation
Approach Solution 1:

The first five prime numbers are: 2, 3, 5, 7, 11.
Mean= sum of observation / number of observations
= 2+3+5+7+11/5
= 28/5
= 5.6
Thus, the mean of the first five prime numbers is 5.6.

Approach Solution 2:

First 5 primes = 2,3,5,7,11.
Clearly avg= (2+3+5+7+11)/5
= 28/5
= 5.6

Approach Solution 3:
First five prime numbers= (2,3,5,7,11)
Sum of the first five prime numbers= 2+3+5+7+11
= 28
Average= 28/5
= 5.6

Therefore, the average of the first five numbers is 5.6

“The average of first five prime numbers is:”- is a topic of the GMAT Quantitative reasoning section of GMAT. To solve GMAT Problem Solving questions a student must have knowledge about a good amount of qualitative skills. GMAT Quant practice papers improve the mathematical knowledge of the candidates as it represents multiple sorts of quantitative problems.

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