Question

please help me i have to do this question
​

Answer 1

Answer:

72.2

Step-by-step explanation:

mean = sum of observations / no. of observations

mean marks of girls = sum of marks of girls/no. of girls

73=sum of marks of girls/30

sum of marks of girls = 73x30

similarly for boys

71=sum of marks of boys/20....since total are 50 and considering only two genders lol just kidding

sum of marks of boys = 20x71

now mean is the whole class

mean = sum of marks of girls+sum of marks of boys/50

(73x30)+(71x20)/50

mean = 72.2

hope it helps u

mark as brainliest