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Question
The mean of 20 observations is 30. If the mean of 15 observations is 32, then the mean of last 5 observations is ______.
Options
24
23
22
20
MCQ
Fill in the Blanks
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Solution
The mean of 20 observations is 30. If the mean of 15 observations is 32, then the mean of last 5 observations is 24.
Explanation:
Total of 20 observations
= 20 × 30
= 600
Total of the 15 observations
= 15 × 32
= 480
Sum of the last 5
= 600 – 480
= 120
So, their mean
= 120 ÷ 5
= 24
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