Answer:
61"-64"
Step-by-step explanation:
There is one thing I'm assuming in order to calculate this, and it is that the size of the classes is homogeneous, meaning, that all clases have the same size from the lower limit to the upper limit.
So, you are given the midpoints of the two lowest classes. If you check the crude graph I drew on paint, you can see that the midpoint is exactly what it sounds, the middle point of each class.
If the classes have the same size, then the "distance" from one midpoint to the next one is 2 times half the size of a class (because you go from mid to upper limit, and then from the lower limit to mid, as you can see in the graph)
if you subtract the greater midpoint from the lower one, you have that distance:
[tex]mid_{2} - mid_{1} = 2*halfclass[/tex]
65.5"-62.5"=3=2*halfclass
[tex]\frac{3}{2}" =halfclass[/tex]
1.5"=halfclass
Now if you subtract the value of halfclass from a midpoint, you get the lower limit, and if you add it you get the upper limit:
Lower limit = 62.5"-1.5"=61"
Upper Limit = 62.5"+1.5"=64"
