If the mean of 10 observation is 20, and that of other 15 observations is 16. Find the mean of all 25 observation.
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Mean of 10 observations = 10
Sum of observations = 10 × 20 = 200
Mean of 15 observations = 15
Sum of observations = 15 × 16 = 240
Total sum of observations = 440
Mean of 25 observations = 440/25 =17.6
Sum of observations = 10 × 20 = 200
Mean of 15 observations = 15
Sum of observations = 15 × 16 = 240
Total sum of observations = 440
Mean of 25 observations = 440/25 =17.6
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Solution is in the pic.
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