Michael's Compute-All, a national computer retailer, has kept a record of the number of laptop computers they have sold for a period of 80 days. Their sales records are shown below: Number of Laptops Sold 0-19 20-39 40-59 60 - 79 80-99 Total Number of Days 5 15 30 20 10 80 a. What is the relative frequency of the class 60-79? [Select] b. What is the percent frequency of the class 80-99? [Select] c. What is the probability that the company will sell 40-59 computers in a given day? [ Select] d. What is the probability that the company will sell less than 100 computers in a given day? [Select]