math

[jpg]

8 adults, 6 children and 2 seniors swim the lengths of a pool over a period of time for everyone.
The average number of lengths described by an adult is 40.
The average number of lengths described by a child is 7 and the average number for the elderly is 35.
What is the average number of lengths described by each of them?
I think we should use reports on this problem. We can draw a bar chart showing all the swimmers. 8 adults describe an average of 40 lengths. So as a start we need to find out how long they have described in total?

 

[lev888]

8 adults, 6 children and 2 seniors swim the lengths of a pool over a period of time for everyone.
The average number of lengths described by an adult is 40.
The average number of lengths described by a child is 7 and the average number for the elderly is 35.
What is the average number of lengths described by each of them?
I think we should use reports on this problem. We can draw a bar chart showing all the swimmers. 8 adults describe an average of 40 lengths. So as a start we need to find out how long they have described in total?

As a start you need to post the relevant formula, identify what data you know and what you need to calculate from the problem's givens.

 

[HallsofIvy]

What do you mean by "each of them" and, in particular, by "them"? I suspect that, by "them", you mean all of these people and that you really intended "all of them" rather than "each of them".

An average is the total divided by the number or cases.
The number of adults is 8 and the average number of lengths is 40 so the total total number of lengths for the adults is 8*40= 320.
The number of children is 6 and the average number of lengths is 7 so the total number of lengths for the children is 6*7= 42.
Then number of seniors/elderly (They aren't adults?) is 2 and the average number of length is 35 so the total number of lengths is 2*35= 70.

So the total number of people is 8+ 6+ 2=16 and the total number of lengths is 320+ 42+ 70= 432. The overall average is 432/16= 27.

 

[jpg]

What do you mean by "each of them" and, in particular, by "them"? I suspect that, by "them", you mean all of these people and that you really intended "all of them" rather than "each of them".

An average is the total divided by the number or cases.
The number of adults is 8 and the average number of lengths is 40 so the total total number of lengths for the adults is 8*40= 320.
The number of children is 6 and the average number of lengths is 7 so the total number of lengths for the children is 6*7= 42.
Then number of seniors/elderly (They aren't adults?) is 2 and the average number of length is 35 so the total number of lengths is 2*35= 70.

So the total number of people is 8+ 6+ 2=16 and the total number of lengths is 320+ 42+ 70= 432. The overall average is 432/16= 27.

Thank you very much!