The frequency distribution shows the blood glucose levels (in milligrams per deciliter) for 50 patients at a medical facility. Construct a histogram, frequency polygon, and ogive for the data. Comment on the shape of the distribution. What range of glucose levels did most patients fall into?

Class limits                  Frequency
60–64............................................2
65–69............................................1
70–74............................................5
75–79..........................................12
80–84..........................................18
85–89............................................6
90–94............................................5
95–99............................................1
...........................................Total 50