Question : P1 is the average of all prime numbers below 12 and P2 is the average of all prime numbers between 12 and 30. What is the value of 5P1 – P2?
Option 1: 7.8
Option 2: 8.6
Option 3: 9.8
Option 4: 7.5
Correct Answer: 7.8
Solution :
The prime number between 1 to 30 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Average =
The average of prime no. below 12 is
Average (
The average of prime no. between 12 to 30,
Average (
The value of 5
Hence, the correct answer is 7.8.