Maharashtra State BoardSSC (English Medium) 9th Standard
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There Are 40 Students in a Class, Out of Them 15 Are Boys. the Mean of Marks Obtained by Boys is 33 and that for Girls is 35. Find Out the Mean of All Students in the Class. - Algebra

Sum

There are 40 students in a class, out of them 15 are boys. The mean of marks obtained by boys is 33 and that for girls is 35. Find out the mean of all students in the class.

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Solution

We have,
Number of students in a class = 40, and
Number of boys in a class = 14,
Mean of marks obtained by boys = 33, and
Mean of marks obtained by girls = 35
Number of girls in the class = 40 - 15 = 25
Sum of marks obtained by boys = 33 x 15 = 495 , and
Sum of marks obtained by girls = 35 x 25 = 875
So, the mean of all students in the class
= ` ( 495 + 875 ) / 40 ` = ` 1370 / 40` = 34.25

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APPEARS IN

Balbharati Mathematics 1 Algebra 9th Standard Maharashtra State Board
Chapter 7 Statistics
Practice set 7.5 | Q 11 | Page 125
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