the names of 10 observations is 20 and that of other 15 observation is 16 find the mean of 25 observations
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Solution:
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
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Total observations = 25
Therefore total outcomes = (20×10) + (16×15)
= 200 + 240
= 440
Therefore, mean = 440/25
= 17.6
Therefore total outcomes = (20×10) + (16×15)
= 200 + 240
= 440
Therefore, mean = 440/25
= 17.6
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