Question

There are 16 boys out of 40 students in a class. The mean marks scored by boys is 33 and those by girls is 35. Find the mean marks scored by all
the students in the class.

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it's too urgent​

Answer 1

Answer:

Total number of students = 40  Number of boys =15  ∴ Number of girls = 40 – 15 = 25  The mean of marks obtained by 15 boys is 33  Here, sum of the marks obtained by boys = 33 x 15  = 495 …(i) The mean of marks obtained by 25 girls is 35 Sum of the marks obtained by girls  = 35 x 25  = 875 …(ii)  Sum of the marks obtained by boys and girls  = 495 + 875 … [From (i) and (ii)] = 1370  ∴ Mean of all the students = 34.25  ∴ The mean of all the students in the class is 34.25.Read more on Sarthaks.com - https://www.sarthaks.com/848579/there-are-students-class-out-them-15-are-boys-the-mean-marks-obtained-boys-and-that-for-girls