Answer
boundary is 124.5-131.5
midpoint is 128
width is 6
Work Step by Step
Since the class has 0 decimal places, the boundary will have 1 decimal place. Subtract 0.5 from smallest value and add 0.5 to the largest value to find the boundary.
$125-0.5=124.5$
$131+0.5=131.5$
To find the midpoint, add the upper and lower values and divide by 2.
$\frac{125+131}{2}=\frac{256}{2}=128$
To find the width, subtract the lower value from the upper value.
$131-125=6$
