Question

Please help. Will fan and medal. c:
The dot plot below shows the amount of time two random groups of students took to brush their teeth. (Picture will be added) Based on visual inspection of the dot plots, which of the following groups, if any, shows a greater average time required to brush their teeth?

Answer 1

@Vocaloid please help if you can. c:

Answer 2

@Mertsj

Answer 3

Please help. :(

Answer 4

I'm very confused on this problem.

Answer 5

Consider group R:
1 student takes 45 seconds to brush = 45 sec
2 students take 50 seconds to brush= 100 sec
1 student takes 55 sec = 55 sec
2 students take 60 sec = 120 sec

Keep doing this and then divide the total seconds by the number of students to find the average.

Answer 6

Ok. But I did that the first time and it said I was wrong. :(

Answer 7

@Mertsj

Answer 8

What did you get for the average for Group R?

Answer 9

Um. I got 1783

Answer 10

Sorry. I had to go look for my work.

Answer 11

Wait. I think I might've forgot to divide. I don't remember.

Answer 12

Yes. That would be the total.

Answer 13

Ok. So, what would I do now?

Answer 14

Is that the total number of seconds for Group R or Group S?

Answer 15

Group R

Answer 16

I got 1446 for group S

Answer 17

Divide by the number of students in Group R to get the average number of seconds per student.

Answer 18

Ok.

Answer 19

1783/21 = 84.9

Answer 20

I got 1730/21 = 82.4

Answer 21

Hm.. I might've added wrong for the average.

Answer 22

I missed the 55 score so I now get 1785/21=85

Answer 23

Ok. Well, I got 1783 for the average, but it's pretty close to yours.

Answer 24

You mean you got 1783 for the total, not the average.

Answer 25

Oh. I think I forgot to put the choices.

Answer 26

Now do Group S

Answer 27

Here are the choices:
A. Group R
B. Group S
C. Both groups show about the same average time.
D. No conclusion about average time can be made from the data.

Answer 28

I got 1446 for Group S

Answer 29

I know A can be eliminated.

Answer 30

I got 1445
And there are only 17 students in Group S

Answer 31

Yeah.

Answer 32

It would have to end in a 0 or a 5 because all the addends are multiples of 5

Answer 33

85.05 is what I got from 1446/17

Answer 34

If you use 1445, you get 85 again so I guess it must be C

Answer 35

Ok. Thanks. I'll try that answer and see if it's correct. Thanks again!

Answer 36

You're welcome.