class of 50 students out of which 30 are girls The mean marks scored by the girls in test is 73 out of hundred and that of boys is 71 determine the mean score of the whole class
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Answer:
72.2
Step-by-step explanation:
number of girls=30
mean marks obtained by girls=73
mean = sum of marks obtained / number of girls( in this case )
sum of marks = mean x number of girls
73 x 30 = 2190 marks
total number of student = 30
number of boys = total number of student - number of girls
50 - 30 = 20
mean marks obtained by boys is 71
mean = sum of marks obtained / number of boys ( in this case )
sum of marks = mean x number of boys
71 x 20 = 1420 marks
total marks obtained by class is 2190 + 1420 = 3610
mean = total marks obtained by class / total number of students
3610 / 50 = 72.2
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