Math, asked by janvhi25, 11 months ago

a class consists of 50 students out of which 20 girls.The mean marks of girls is 73 and of boys is 71.find the mean of all students?

Answers

Answered by nithin94

STUDENTS =50
GIRLS =20

BOYS=30

MEAN OF GIRLS =73

MEAN OF BOYS=71

MEAN=SUM OF ALL OBSERVATIONS
NUMBER OF OBSERVATIONS.

73+71 /2

71+73=144.

144÷2=72

HOPE IT HELPS YOU.

janvhi25: i can not understand it

janvhi25: difficult

nithin94: it

nithin94: is very easy

nithin94: u know that boys and girls mean

janvhi25: yes

nithin94: Take the formula for that 73+71÷2

nithin94: answer is 72

janvhi25: but y

janvhi25: explain it

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