Question

plz solve from 11 to 14

Answer 1

11. mean income of 3 members is 8000
total income is 8000×3= 24000
other person income is 10000

Total income is 34000

Mean income is 34000/4=8500

12. mean age of 6 persons is 14.5

Age of them in total is 14.5×6=87

Mean age of 4 persons is 13.25

Total age of them is 53

So 87-53=34

When age of 5th is 16 years

So 34-16=18

13.Total weight of 16 students is 16×40=640

When one boy weight 25 leaves the school 640-25=615

Now total 15 students r present
So 615/15=41

14.Total weight of 26 boys is 26×40=1040
Total weight of 14 girls is 14×35=490

So total weight of 40 students is 1040+490=1530

Mean weight is 1530/40=38.25