The following cumulative frequency polygon shows the selling price ($000) of houses sold in the Billings, Montana, area.


.:.
a. How many homes were studied?
b. What is the class interval?
c. One hundred homes sold for less than what amount?
d. About 75% of the homes sold for less than what amount?
e. Estimate the number of homes in the $150,000 up to $200,000 class.
f. About how many homes sold for less than $225,000?