Test Index

JAMB Mathematics 2018 Paper

Question : 45

Total: 62

Find the average of the first four prime numbers greater than 10

Solution:

Concept:

Prime numbers have only two factors:

1

and the number itself.

Explanation:

The first four prime numbers greater than

10

are

11

13

17

, and

19

To find their average, add them together and divide by the total count, which is

4

Sum of the numbers:

11 + 13 + 17 + 19 = 60

Average

= \frac{60}{4} = 15

Answer:

The correct option is D.

15

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