Question

The average of 40 observations is 50 and the average of another 60 observations is 55. The average of all observation is

• A. 50
• B. 53
• C. 62
• D. 83

Answer 1

Answer:

B. 53

(50 x 40 + 55 x 60) / (40+60) = 5300/ 100 = 53