Question : What will be the average of all the prime numbers between 9 and 22?
Option 1: 14
Option 2: 15
Option 3: 10
Option 4: 12
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Correct Answer: 15
Solution : According to the question Prime numbers between 9 and 22: are 11, 13, 17,19 Average of $n$ observations is given by $\frac{\text{Sum of all observations}}{n}$ ⇒ Average = $\frac{(11 + 13 + 17 + 19)}{4}$ = 15 Hence, the correct answer is 15.
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