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The amounts of electricity bills for all households in a city have a skewed probability distribution with a mean of $139 and a standard deviation of $30. Find the probability that the mean amount of electric bills for a random sample of 75 households selected from this city will be between $132 and $136. Round to 4 decimal places.
Suppose today's sample yielded a mean of $4.19 and a standard deviation of $0.10, create and interpret a 99% confidence interval for the population standard deviation. Assume the distribution of gas prices in the area follows a normal distribution..
Customers arrive at an automated coffee vending machine at a rate of 4 per minute, following a Poisson distribution. What is the average number of people waiting in line?
The scores of the GRE exam are transformed so they have a mean of 500 and standard deviation of 100. The scores are known to be normally distributed. What is the percentage of students that score below 750?
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents
At a .01 level of significance, test whether there is a difference between the 2 sample means. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
Prove that there are no integers x, y, and z such that. Show that square root of 2 cubed is an irrational number.
Suppose that the risk of allergies for the children of nonsmokers is 0.15. What is the risk of allergies for the children of smokers?
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
Given P(x), where P describes the kth Lagrange polynomial that interpolates f at k+ 1 points:
A survey of 400 persons showed that 54.3% were in favor of product A. Test whether a majority were in favor of product A using a .05 significance level
Construct a 95% confidence interval estimate for the population proportion of airline travelers who think that the airline fee that is most unreasonable is additional charges to redeem point/miles.
HIV found that 3 received a false positive test result. Test the researcher's claim of a 2% false positive rate at the a = 0.05 level. What can you conclude?
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