Question

A teacher is making a histogram of the test scores of his 25 students on the last test. The scores range from 40 to 100. What scale is BEST to use on the x-axis?
A) 1 point
B) 5 points
C) 10 points
D) 20 points

Answer 1

C. This ensures that everything will be encompassed, but also provides more accuracy than the D answer choice.

Answer 2

Honestly it depends. A & B are wrong simply because they would involve too many bars. A would have 60 and B would have 12 which are too many. 

For C you would use 5 bars and for D you would use 3

If I were to do it, I'd go with C, since 3 bars are really too few for a histogram.

Answer=C