Questions from Statistics Principles

Q: Th e number of weekly breakdowns of a department's computing system is

Th e number of weekly breakdowns of a department's computing system is a random variable having a Poisson distribution with m = .4. What is the probability the computer will run for two consecutive we...

Q: A Poisson distribution with m = 1.2 governs the number

A Poisson distribution with m = 1.2 governs the number of fireflies that flash in a l O second period during an August evening in the yard. Determine the probability that: (a) 2 fireflies flash. (b)...

Q: A Poisson distribution with m = 2.5 governs the yearly

A Poisson distribution with m = 2.5 governs the yearly number of tornado touchdowns in a central area of the state. Find the probabilities P [ X ≤ 1 ] and P [ X ≥ 1 ] .

Q: For health reasons, homes need to be inspected for radon gas

For health reasons, homes need to be inspected for radon gas that decays and produces alpha particles. One device counts the number of alpha particles that hit its detector. To a good approximation, i...

Q: Records over several years show that the probability is .00003 that

Records over several years show that the probability is .00003 that a car will have a flat tire while driving through a long tunnel. About 16,000 cars use the tunnel each week. Determine the probabili...

Q: According to a recent Federal Trade Commission Report, about .13

According to a recent Federal Trade Commission Report, about .13% of the persons in the 20-29 year old age group filed identity theft complaints. From a random sample of n = 600 persons 20-29 years ol...

Q: Which of the functions sketched below could be a probability density function

Which of the functions sketched below could be a probability density function for a continuous random variable? Why or why not?

Q: Males 20 to 29 years old have a mean height of 69

Males 20 to 29 years old have a mean height of 69.4 inches with a standard deviation of 3.5 inches. Females 20 to 29 years old have a mean h eight of 64.1 inches with a standard deviation of 3.1 inche...

Q: Two pieces of wood need to be glued together. After applying

Two pieces of wood need to be glued together. After applying glue to both pieces, they must be clamped to obtain the best results. The required clamping time in any application is a random variable. F...

Q: Faced with a tight deadline on two major projects, you decide

Faced with a tight deadline on two major projects, you decide to hire two of the five available persons to help complete the work. They have 2, 3, 5, 3, and 2 years experience, respectively. Since the...