The San Diego Union Tribune reported that the 30-year fixed-rate mortgage rates had risen to an average of 5.74%. A sample of mortgage rates in the San Diego area produced the following interest rates:

5.84 5.73 5.58 5.69 5.84 5.68 5.73 5.79 5.77 5.67 5.76 5.70 5.70 5.66 5.71 5.80 5.81 5.75 5.81 5.78 5.79 5.77 5.73 5.67 5.74 5.76 5.76 5.74 5.73 5.71 5.71 5.72 5.80 5.69 5.88 5.70 5.75 5.75 5.68 5.72 5.70 5.67 5.83 5.76 5.80

a. Construct a histogram with eight classes beginning at 5.58.

b. Determine the proportion of mortgage rates that are at least 5.74%.

c. Generate an ogive for this data.