1.

The average of a set of 7 observations is 36 and that of another set of 13 observations is 46. What is the combined average of the set?1. 40.52. 41.53. 42.54. 43.5

Answer» Correct Answer - Option 3 : 42.5

Given:

The average of 7 observation = 36

The average of another 13 observations = 46

Formula used:

Combined average/weighted average = Sum of observations/Total number of observation

Calculation:

Total of 7 observation = Average × 7 = 36 × 7 = 252

Total of 13 observations = Average × 13 = 46 × 13 = 598

Combined average = (36 × 7 + 46 × 13)/(7 + 13)

∴ Combined average = 850/20 = 42.5



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