two years ago the mean age of 40people was 11years now a person left the group and the mean age is changed to 12years find the age of the person who left the group
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Given that
let us consider
sum=x
The mean age of 40 people =11yrs
mean =sumof observations/no. of observations
11=x/40
40×11=x
440=x
The mean age of 39 people=12yrs
let us consider
sum=y
mean=sum of observations /no. of observation
12=y/39
12×39=y
468=y
The age of the person left from the group=520-468=52
plz mark as brainliest........
let us consider
sum=x
The mean age of 40 people =11yrs
mean =sumof observations/no. of observations
11=x/40
40×11=x
440=x
The mean age of 39 people=12yrs
let us consider
sum=y
mean=sum of observations /no. of observation
12=y/39
12×39=y
468=y
The age of the person left from the group=520-468=52
plz mark as brainliest........
SaiNiranjan:
how the 520 came
how the no. 520 came
this is wrong I unexpectedly said thanks
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