24. The mean score of 25 observations is 80 and the mean score of anothe
55 observations is 60. Determine the mean score of the whole set
observations.
- 36 moclo in Findlich
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Answer:
Step-by-step explanation:
mean of 25 observations = 80
sum of all observations = 25×80 = 2000
mean of 55 observations is = 60
sum of all observations = 55×60=3300
the mean score of the whole set = (3300 + 2000)/(25+55)
= 5300/80 ≈ 66.25
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