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Suppose that the life span of a certain type of fan has an exponential distribution with a mean life span of 25000 hours. Find the probability thaat a randomly selected fan will last
a. at least 20000 hours
b. between 20000 and 30000 hours
With a mean of 1.30 inches and standard deviation of 0.04 inch. If you select a random sample of 16 Ping-pong balls, what is the sampling distribution of the mean?
Using the 0.01 level of significance, is there evidence that the mean shopping time at the supermarket is different from the claimed value of 22 minutes?
Discuss how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same, and provide a numerical example?
In a survey about satisfaction with local phone service, those respondents who rated their current service as excellent and those who rated it Poor-Very Poor were asked to classify their current local service provider. The results are given in the..
Standard deviation of 3.2 days. If a nursery plants 100,000 of these seeds, how many will germinate in less than 20 days?
15 pieces are selected at random for inspection. What is the probability of exactly 4 defective pieces being found in the sample?
real estates salesthe association of real estate agents for foreign properties areafp is a local body representing
Multiple choice questions based on F-distribution.
The mean of major student taking the GRE test in 2010 was 1000 with a standard deviation of 230. if you select a random sample of 75 students, what is the probabbility that the mean score is below 950?
An emergency program set up by the state. approximate the probability that the intersection in question will come under the emergency program at the end of the next year.
What is the optimal solution if the annual return for U.S. Oil changes from $3 to $8 per share (everything else stays the same)? What is the value of the total return?
If one of these consumers is randomly selected, what is the probability that the person prefers design A and is under 25?
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