What is the difference between the average of prime numbers between 30 and 50 and the average of multiples of 3 between 20 and 50?
A.2.6
B.5.3✓ Correct
C.4.5
D.3.2
Explanation
Prime numbers between 30 and 50: 31,37,41,43,47; average = 199/5 = 39.8. Multiples of 3 between 20 and 50: 21,24,...,48; average = 345/10 = 34.5. Difference = 39.8 − 34.5 = 5.3.
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