Question

there are 40 student in a class , out of them 15 are boys , the mean of marks obtained by boys is 33 and that for girl is 35 , find out the mean of all student in the class​

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

Answer 2

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