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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 |
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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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