Question

He average weight of 50 boys in a class is 48 kg and that of 30 girls in the class is 38 kg. Find the average weight of all the students in the class 43 kg 84.5 kg 45 kg 44.25 kg

Answer 1

Answer:

44.25

Step-by-step explanation:

50 boys average is 48

30 girls average is 38

now am combining 30 girls average with 50 boys

for 50 boys the average should be 48 each has to bring 48 but each member in girls group has average of only 38 ie 10 less for each member

totally for 30 girls 300 less

in combining girls with boys total 80 but 300 less

so 300/80 = 3.75

so 48-3.75= 44.25

so average Weight of all students in the class is 44.25

we can also combine boys with girls method too

another general method is 50 avg 48 ie 48*50= 2400

30 avg 38 ie 38*30= 1140

total 80 avg is 2400+1140 = 3540/80= 44.25

but first method will be done so fast with mind if we practice