The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is :

A. 58

B. 56

C. 50

D. 46

Answer: Option B

Solution(By Examveda Team)

Let the new observation be = x
According to the question,
6 × 45.5 + x = 7 × 47
273.0 + x = 329
x = 329 - 273
x = 56