Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 31

Hardware Store: Income Trevor is interested in purchasing the local hard­ware/sporting goods store in the small town of Dove Creek. Montana. After examining accounting records for the past several years, he found that the store has been grossing over $850 per day about 60% of the business days it is open. Estimate the probability that the store will gross over $850
(a) at least 3 out of 5 business days.
(b) at least 6 out of 10 business days.
(c) fewer than 5 out of 10 business days.
(d) fewer than 6 out of the next 20 business days. Interpretation If this actually happened, might it shake your confidence in the statement p = 0.60 Might it make you suspect that p is less than 0.60 Explain.
(e) more than 17 out of the next 20 business days. Interpretation If this actually happened, might you suspect that p is greater than 0.60 Explain.