Bluman A.G. Elementary Statistics- A Step By Step Approach

Section 4–2 The Addition Rules for Probability 207Extending the Concepts27. Purchasing a Pizza The probability that a customerselects a pizza with mushrooms or pepperoni is 0.55,and the probability that the customer selects onlymushrooms is 0.32. If the probability that he or sheselects only pepperoni is 0.17, find the probability of thecustomer selecting both items. 0.06LAFF-A-DAY28. Building a New Home In building new homes, acontractor finds that the probability of a home buyerselecting a two-car garage is 0.70 and of selecting aone-car garage is 0.20. Find the probability that thebuyer will select no garage. The builder does not buildhouses with three-car or more garages. 0.1029. In Exercise 28, find the probability that the buyer willnot want a two-car garage. 0.3030. Suppose that P(A) 0.42, P(B) 0.38, andP(A B) 0.70. Are A and B mutually exclusive?Explain. No. P(A B) 0“I know you haven’t had an accident in thirteen years.We’re raising your rates because you’re about due one.”© Bob Schochet. King Features Syndicate.Technology Step by StepMINITABStep by StepCalculate Relative Frequency ProbabilitiesThe random variable X represents the number of days patients stayed in the hospital fromExample 4–14.1. In C1 of a worksheet, type in the values of X. Name the column X.2. In C2 enter the frequencies. Name the column f.3. To calculate the relative frequencies and store them in a new column named Px:a) Select Calc>Calculator.b) Type Px in the box for Store result in variable:.c) Click in the Expression box, then double-click C2 f.d) Type or click the division operator.e) Scroll down the function list to Sum, then click [Select].f ) Double-click C2 f to select it.g) Click [OK].The dialog box and completed worksheet are shown.4–27