Question

the mean of marks scored by 34 boys in a class is 57.the mean of marks of all 60 students of the class is 59.find the mean marks scored by the girls.​

Answer 1

Answer:

50

Step-by-step explanation:

60-10=50

ans:50

59-9=50ans50

Answer 2

Answer:

61.61

Step-by-step explanation:

In the question,

Number of boys in the class = 34

The mean marks scored by the boys = 57

Total number of students in the class = 60

The mean marks scored by the whole class = 59

So,

The number of girls in the class are = 60 - 34 = 26

So,

$Mean = \frac{Total\ Marks }{No.\ of\ People}$

So,

$57=\frac{T_{b} }{34}\\ T_{b}=57\times34=1938$

where,

$T_{b}$ is the Total marks by the boys.

Now,

$59=\frac{T}{60} \\T=3540$

Here, T is the total marks of the Class.

So,

The Total marks of the Girls = Total marks of the class - Total marks of the boys

$T=T_{b}+T_{g}\\3540=1938+T_{g}\\So,\\T_{g}=1602$

where,

$T_{g}$ is the Total marks by the girls.

Therefore,

Mean marks obtained by the Girls = Total marks by the Girls / Number of Girls

So,

Mean marks of Girls = 1602/26

Hence, the Mean marks of Girls = 61.61