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)
13th Jan, 2024
Correct Answer: $9\frac{5}{8}$
Solution :
Prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17 and 19.
Average = $\frac{\text{Sum of all observations}}{{\text{Total number of observations}}}=\frac{(2 + 3 + 5 + 7 + 11 + 13 + 17 + 19)}{8}=\frac{77}{8}=9\frac{5}{8}$
Hence, the correct answer is $9\frac{5}{8}$.
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