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Question : The average of prime numbers between 1 and 20 is:
Option 1: $9$
Option 2: $9\frac{5}{8}$
Option 3: $10\frac{1}{8}$
Option 4: $8$
Answer (1)
Correct Answer: $9\frac{5}{8}$
Solution :
Prime numbers between 1 to 20 = 2, 3, 5, 7, 11, 13, 17, 19
Their sum = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 = 77
Total numbers = 8
$\therefore$ Average = $\frac{77}{8}=9\frac{5}{8}$
Hence, the correct answer is $9\frac{5}{8}$.
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