Question

The dot plots below show the test scores of sixth- and seventh-grade students:

Dot plot for Grade 6 shows 6 dots on score 70, 4 dots on score 80, 6 dots on score 90, and 4 dots on score 100. Dot plot for Grade 7 shows 5 dots on score 50, 7 dots on score 60, 4 dots on score 70, and 4 dots on score 80.

Based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score?

Grade 6
Grade 7
Both groups show about the same mean score.
No conclusion about mean score can be made from the data.

Answer 1

medal and fan!!!!!!

Answer 2

@ILovePuppiesLol

Answer 3

@mayankdevnani could u help

Answer 4

do you have any clue? @ILovePuppiesLol

Answer 5

anyone???????

Answer 6

hold on, alot of people are taggin me

Answer 7

@Mehek14 please help this person, i will give u a potato

Answer 8

@Mehek14 plzzz i will medal and fan!!! :)

Answer 9

I can help. One way to solve this (and I know it says visual inspection, but they'll never know) is to just find the mean of each grade. To find the mean, you add up all of the numbers from that grade and divide by how many numbers are there.

So for grade 6: 6(70)+4(80)+6(90)+4(100) = 1680 / 20 = 84.
Grade 7: 5(50)+7(60)+4(70)+4(80) = 63.5
So clearly, grade 6 has the higher mean score.

If you didn't want to do that math, you can just look at the dots and see there are 10 or 1/2 of the grades for grade 6 are 90's or higher, while there are no 90's or higher on grade 7.

Hope this helps!

Answer 10

So its A?

Answer 11

Yep!

Answer 12

thank you so much!

Answer 13

can you help with another one?

Answer 14

Sure, post a new question and tag me!

Answer 15

ok thanks !