Ex 12) the quick change oil company has a number of outlets in the
metropolitan Seattle area. The daily number of oil changes at the Oak
Street outlet in the past 20 days is:
a.
How many classes would you recommend?
d. Organize the number of oil changes into a frequency distribution.
Ex 14) the food services division of Cedar River Amusement Park
Inc, is studying the amount that families who visit the amusement
park spend per day on food and drink. A sample of 40 families who
visited the park yesterday revealed they spend the following amounts:
a.
Organize the data into a frequency distribution, using seven
classes and 15 as the lower limit of the first class. What class interval
did you select?
b.
Where do the data tend to cluster?
Ex 18) Ecommerce.com, a large Internet retailer, is studying the lead
time (elapsed time between when an order is placed and when it is
filled) for a sample of recent orders. The lead time are reported in
days.
a. How many orders were studied?
b. What is the midpoint of the first class?
c.
What are the coordinates of the first class for a frequency
olygon assuming we draw a frequency polygon using the midpoints?
Ex 20) The following cumulative frequency polygon shows the
selling price ($000) of house sold in the Billings, Montana, area
a. How many orders were studied?
b. What is the class interval?