The average of 7 natural numbers is 70. Among them, six numbers are 32, 69, 72, 65, 79, and 48. What is the seventh number?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 125.
We know that,
Average = Sum of observations/Number of observations
The average of the seven numbers = 70
So, the sum of the seven numbers = 7 × 70 = 490
According to the question,
⇒ 490 = 32 + 69 + 72 + 65 + 79 + 48 + x
⇒ 490 - 365 = x
⇒ x = 125