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प्रश्न
Mean temperature of a city in a certain week is 30°C. If the mean temperature of first 3 days of the week is 32°C, what is the mean temperature of last 4 days of the week?
बेरीज
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उत्तर
The mean temperature for the 7 days is 30°C.
Total temperature for the week = mean × number of days
= 30 × 7
= 210°C
The mean temperature for the first 3 days is 32°C.
Total temperature for the first 3 days = mean × number of days
= 32 × 3
= 96°C
Total temperature for the last 4 days = 210 − 96
= 114°C
Mean temperature for the last 4 days = `"Total temperature for the last 4 days"/"Number of days"`
= `114/2`
= 28.5°C
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