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The Acme Light Bulb Company claims that the lifetimes of its 100-Watt light bulbs follow a normal distribution with a mean of 325 hours and a standard deviation of 35 hours.
a) Find the probability that a randomly selected Acme 100-Watt light bulb will fail in less than 315 hours.
b) What lifetime corresponds to the 95th percentile?
b) A random sample of 50 light bulbs is taken. What is the probability that the sample mean lifetime is less than 315 hours?
The mean daily amount of her tips was $24.85, with a standard deviation of $3.24. Can Ms. Brigden be 99% confident that she is earning an average of $20 or more per day in tips?
The proportion of left handers is 0.10. What is the number of left handers in the sample and what notation is given to that number?
question 1 the average teachers salary in arizona is 42300 with standard deviation 5000. assuming a normal distribution
If x is a binomial random variable where n=100 and p=.1, find the probability that x is less than or equal to 11 using the normal approximation to the binomial.
a simple random sample of fico credit rating score is obtained and the score are listed below. as of this writing the
Demand for a popular athletic shoe is nearly constant at 800 pairs per week for a regional division of a national retailer. The cost per pair is $54.
What is the probability a random sample of 75 students will provide a sample mean Sat score within 20 of the population mean?
1. Suppose you are given a particular set of data and found that r = 2.5. How would you interpret this result?
On a particular day during the most recent golf tournament, the organizer placed the whole (pin) in 0 back left corner of the green. 64 golfers played the hole with the new placement on that day. Find out the probability of the sample average numb..
An element E has a constant failure rate λ and a reliability at time t of R(t)=p, if p=0.5 and 0.9, what is the effect on Rs(t), basic reliability, serial Mean Time Between Failure, hs(t), MTBFs if additional elements are added to the baseline sys..
james teaches a class of 300 students and only 6 have done their homework assignment which is due today. he calls on a
What is the probability that between 5 and 10 firms, inclusively, purchase a Unix machine from Sun Microsystems?
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