Question

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

Answer 1

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