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1. A particular production process produces bolts whose diameter is a N ( 3, 16) random variable.
(a) Find the probability that a randomly selected bolt will have a diameter less than 3.2.
(b) Find the probability that the average diameter from a sample of 35 bolts will be less than 3.2.
2. Customers arrive at a counter in accordance with a Poisson process of density three arrivals per minute.
(a) What is the expected number of arrivals per minute?
(b) What is the standard deviation of the number of arrivals per minute?
(c) Use the CLT to approximate the probability that the average number of arrivals in 75 I-minute periods is between 2.6 and 3.4.
During the last week of the semester , students at a certain college spends on the average 4.2 hours using the school's computer terminals with a standard deviation of 1.8 hours .for a random sampling of 36 students at that collage.
question a research firm conducted a survey to determine the mean amount smokers spend on cigarettes during a week. a
examine the below topic and provide a hypothesis for which you would use the one-tailed and two-tailed t test to
The critical values are values of the test statistics that separate the rejection region from the non rejection region. Is this true? Explain answer.
What is the probalility that the mnean annual snowfall during 64 randomly picked years will exceed 107.8 inches? Round your answer to four decimal places.
the time to failure of a battery in hours of a personal handheld music device follows an exponential distribution. the
Determine the lowest weight a student can have and still be qualified to enter the school.
A store has an average of 25 people arriving each minute to checkout and each person on the average require 4 minutes to be processed at the checkout. What is the minimum number of cashiers required?
Collect data for at least 10 days. Do you think the data will provide a valid representation of these activities? Explain why or why not. Future SLP assignments depend on this data and thus this assignment needs to be completed early in the s..
personnel tests are designed to test a job applicants cognitive andor physical abilities. a particular dexterity test
a it is known that the annual snowfall totals in maine are normally distributed with a mean of 80.3 inches and a
The rise of gasoline prices along with record profits at Exxon-Mobile produced stories of corporate greed. How could you use a statistical model to explain the rise of prices at the pump?
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