The owner of a restaurant was interested in studying ordering patterns of patron

Question

The owner of a restaurant was interested in studying ordering patterns of patrons for the Friday to Sunday weekend time period. Records were maintained that indicated the demand for dessert during this period of time. The results are as follows: 14. Management will add new desserts to the dessert menu if 20 % of the patrons order desserts. Will the desert menu be added to : (Prove Statistically) 15. Warranty records show that the probability for a new car needing repair while it is under warranty (first 90 days) is 5%. If a sample of three new cars is selected, what is the probability that in the first 90 days at least one needs repair while the car is under warranty?

Explanation / Answer

Total number of person surveyed = 96+40+224+240 = 600.

Dessert ordered = 136

Dessert not ordered = 464

P(order) = 136/600 = 0.2266

P(order req.) = 0.2

So, management should include dessert in the menu as this probability is more than 20%.

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