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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Prime numbers are numbers that has only two factors (i.e 1 and itself). They are numbers that are only divisible by 1 and their selves. First four prime numbers greater than 10 are 11, 13, 17 and 19
\(\text{Average} = \cfrac{\text{Sum of numbers}}{\text{number}}\)
= \(\cfrac{(11 + 13 + 17 + 19)}{4}\)
= \(\cfrac{60}{4}\)
= 15