In business, percents are frequently used to represent the portion of observations falling within classes of a frequency distribution. A relative frequency distribution expresses the distribution as percents. To convert a frequency distribution to a relative frequency distribution, divide each of the class frequencies (portion) by the total number of observations (base). Remember, rate = portion : base. Round your answers to tenths. (a) From the frequency distribution of sales receipts for an internet cafe, convert each class frequency to a relative class frequency, percents. Class Frequency Relative Frequency $4.00-4.99 2 % $5.00-5.99 $6.00-6.99 8 % $7.00-7.99 8 % $8.00-8.99 5 % $9.00-9.99 3 % total 30 % (b ) What percent of the sales receipts were paid between $5.00 and $5.99? (c) What percent of the sales receipts were $7.00 or more? % (d) What percent of the sales receipts were less than $8.00? %