Questions from Business Statistics

Q: Here are the annual numbers of deaths from floods in the United

Here are the annual numbers of deaths from floods in the United States from 1995 through 2015: 80, 131, 118, 136, 68, 38, 48, 49, 86, 82, 43, 76, 87, 82, 56, 103, 113, 29, 82, 38, 176 Find these stati...

Q: Based on concerns raised by his preliminary research, the biologist in

Based on concerns raised by his preliminary research, the biologist in Exercise 38 decides to collect and examine 150 frogs. 1. Assuming the frequency of the trait is still 1 in 8, determine the mean...

Q: A lecture hall has 200 seats with folding arm tablets, 30

A lecture hall has 200 seats with folding arm tablets, 30 of which are designed for left-handers. The average size of classes that meet there is 188, and we can assume that about 13% of students are l...

Q: An airline, believing that 5% of passengers fail to show

An airline, believing that 5% of passengers fail to show up for flights, overbooks (sells more tickets than there are seats). Suppose a plane will hold 265 passengers, and the airline sells 275 ticket...

Q: A newly hired telemarketer is told he will probably make a sale

A newly hired telemarketer is told he will probably make a sale on about 12% of his phone calls. The first week he called 200 people, but only made 10 sales. Should he suspect he was misled about the...

Q: Shortly after the introduction of the euro coin in Belgium, newspapers

Shortly after the introduction of the euro coin in Belgium, newspapers around the world published articles claiming the coin is biased. The stories were based on reports that someone had spun the coin...

Q: We have looked at various facts about hurricanes in previous chapters.

We have looked at various facts about hurricanes in previous chapters. Suppose we find that the arrivals of hurricanes can be modeled by a Poisson distribution with mean 2.45. 1. What the probability...

Q: I am the only bank teller on duty at my local bank

I am the only bank teller on duty at my local bank. I need to run out for 10 minutes, but I don’t want to miss any customers. Suppose the arrival of customers can be modeled by a Poisson distribution...

Q: Worldwide, tuberculosis is the number-one cause of death from

Worldwide, tuberculosis is the number-one cause of death from an infectious disease. But the majority of cases are in developing countries. In the U.S., the probability of contracting TB is small, wit...

Q: Suppose the probability of a major earthquake on a given day is

Suppose the probability of a major earthquake on a given day is 1 out of 10,000. 1. What the expected number of major earthquakes in the next 1000 days? 2. Use the Poisson model to approximate the pro...