Question : What is the average of the first 10 prime numbers?
Option 1: 10.9
Option 2: 12.9
Option 3: 11.9
Option 4: 13.9
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Correct Answer: 12.9
Solution : The first 10 prime numbers are: 2, 3, 5, 7, 11, 13, 17,19, 23, 29 ⇒ Average = $\frac{\text{Sum of observation}}{\text{Number of observation}}$ = $\frac{(2+3+5+7+11+13+17+19+23+29)}{10}$ = $\frac{129}{10}$ = 12.9 Hence, the correct answer is 12.9.
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Question : The average of 4 numbers is 45. The average of the first two numbers is thrice the average of the other two numbers. What is the sum of the first two numbers?
Option 1: 122
Option 2: 105
Option 3: 125
Option 4: 135
Question : What is the average of the first 10 even numbers?
Option 1: 12
Option 2: 10
Option 3: 13
Option 4: 11
Question : What is the average of first 10 natural numbers?
Option 1: 5.5
Option 3: 5
Option 4: 10.5
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
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: $8$
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