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प्रश्न
The daily consumption of milk in litres by 10 families in a colony are given below:
3.5, 3, 2, 2.5, 4, 3, 1, 5, 3.5, 1.5
Find their mean and median.
बेरीज
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उत्तर
Sum of all the observations = 3.5 + 3 + 2 + 2.5 + 4 + 3 + 1 + 5 + 3.5 + 1.5 = 29
Number of families = 10
Mean = `"Sum of observations"/"Total number of families"`
= `29/10`
= 2.9
The mean daily consumption is 2.9 litres.
Arranging the numbers in ascending order = 1, 1.5, 2, 2.5, 3, 3, 3.5, 3.5, 4, 5
n = 10 observations
∴ Two middle numbers
`(n/2)`th
= `10/2`
= 5th
`(n/2 + 1)`th
= `10/2 + 1`
= 6th
Median = `(3 + 3)/2`
= 3
The median daily consumption is 3 litres.
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