FAN AND MEDAL
The dot plots below show the test scores of seventh- and eighth-grade students:

Question

FAN AND MEDAL
The dot plots below show the test scores of seventh- and eighth-grade students:

anonymous · Answer

attachment

anonymous · Answer

Based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score?

 Grade 7
 Grade 8
 Both groups show about the same mean score.
 No conclusion about mean score can be made from the data.

anonymous · Answer

@GreatGuy

welshfella · Answer

Note that one group as a number of scores of 90 while the other does not

anonymous · Answer

add all the numbers and divide by how many there is.

anonymous · Answer

yes

welshfella · Answer

also one group has some scores in 50's and the other has none -

welshfella · Answer

both groups have 20 members

anonymous · Answer

thanks

anonymous · Answer

group 7 has the hightest mean 
group 7 2355
group 8 1808

welshfella · Answer

as you can see - grade 7 marks have a quite similar spread of marks but they are translated up 10 marks compared with grade 8

welshfella · Answer

yw