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Homework answers / question archive / Question1) Data show that the weight of an offensive linesman may be any weight between 200 and 350 pounds

Question1) Data show that the weight of an offensive linesman may be any weight between 200 and 350 pounds

Statistics

Question1)

Data show that the weight of an offensive linesman may be any weight between 200 and 350 pounds. The distribution of weight is based on a ______________.

 

 

   

 

   

 

Question 2.

 

Judging from recent experience, 5% of the computer keyboards produced by an automatic, high-speed machine are defective. If six keyboards are randomly selected, what is the probability that none of the keyboards are defective?

 

 

 

 

 

 

 

 

 

   

 

   

 

Question 3.

 

Which of the following is correct about a probability distribution?

 

 

   

 

   

 

Question 4.

 

A statistics professor receives an average of five e-mail messages per day from s. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have two messages?

 

 

   

 

   

 

Question 5.

 

For the following distribution:

   

What is the variance of the distribution?

 

 

   

 

   

 

Question 6.

 

What is the only variable in the Poisson probability formula?

 

 

   

 

   

 

Question 7.

 

For the following distribution:

   

What is the variance of the distribution?

 

 

   

 

   

 

Question 8.

 

For the following distribution:

   

What is the mean of the distribution?

 

 

   

 

   

 

Question 9.

 

Which shape describes a Poisson distribution?

 

 

   

 

   

 

Question 10.

 

A listing of all possible outcomes of an experiment and their corresponding probabilities of occurrence is called a ____________.

 

   

 

   

 

   

 

   

 

   

 

   

 

Question 11.

 

Tables of normal distribution probabilities are found in many statistics books. These probabilities are calculated from a normal distribution with ___________.

 

 

   

 

   

 

Question 12.

 

For the normal distribution, the mean plus and minus two standard deviations will include about what percent of the observations?

 

 

   

 

   

 

Question 13.

 

A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?

 

 

   

 

   

 

Question 14.

 

The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is between 125 and 140 minutes?

 

Question 15.

 

A new extended-life light bulb has an average life of 750 hours, with a standard deviation of 50 hours. If the life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?

 

 

   

 

   

 

Question 16.

 

Which of the following is true in a normal distribution?

 

 

 

 

 

 

 

 

 

   

 

   

 

Question 17.

 

The upper and lower limits of a uniform probability distribution are __________.

 

 

   

 

   

 

Question 18.

 

What is the probability that z is between 0.0 and 2.0?

 

 

 

 

 

 

 

 

 

   

 

   

 

Question 19.

 

What is an important similarity between the uniform and normal probability distributions?

 

 

   

 

   

 

Question 20.

 

Which of the following is true regarding the normal distribution?

 

 

 

 

 

 

 

 

 

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