What is the arithmetic mean of first 8 multiples of 13?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 58.5
⇒ The arithmetic mean of an even number of terms will be the average of (n/2)th and ((n/2) + 1)th term.
⇒ Average of 4th & 5th term = (52 + 65)/2
⇒ 117/2 = 58.5