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11 is prime.
11 is prime.
The first four prime numbers greater than 10 are , 11, 13,17,19 Their mean is (11 + 13 + 17 + 19) / 4 = 15 NB '15' is NOT a prime number.
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
11 and 13