Maths Question (I need help -.-) ?

Question

How do you work this out : )

a) If a swimming team had a total weight of 2288kg and the mean weight per swimmer is 81.5kg how many swimmers are in a team

b) If 6 boys have a height of 170 cm and there was 29 boys what is the percentage of boys at 170 cm

Answer 1

a) mean wt = 81.5 kg

2288 kg / (81.5 kg / swimmer) = 28 swimmers

b) % = 6/29 x 100 = 20.7%

Answer 2

a) The mean of data is an average of the data. So the answer is;

2288 ÷ 81.5 = 28.07361963... There are about 28 swimmers in the team.

b) 6 / 29 x 100 = 20.68965517... About 20.7 % (2dp)

Answer 3

a) use the equation total weight/number of swimmers = mean weight.  Plug in the numbers you already know and rearrange the equation to solve for the number of swimmers.

b) The question is saying 6 is what percentage of 29.  To get percentage, use the equation 6/29 x 100%

Answer 4

a ) no of swimmers=2288/81.5=28  no

b) (6/29)*100=20.6896%