The average attendance in a school for the first 4 days of the week is 30 and for the first 5 days of the week is 32. The attendance on....?
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The attendance on fifth day is 40.
The average attendance in a school for the first 4 days of the week is 30 and for the first 5 days of the week is 32.
We have to find the attendance on fifth day.
Average attendance of first four days = 30
We know, Average = sum of observations/total number of observations
∴ Sum of attendance of first days = 30 × 4 = 120
Similarly,
Average attendance of first five days = 32
∴ Sum of attendance of first 5 days = 32 × 5 = 160
The attendance on fifth day = sum of attendance of first 5 days - sum of attendance of first 4 days
= 160 - 120
= 40
Therefore the attendance on fifth day is 40.
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