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Computing probability values using normal distribution.
A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000.How many students earned between $20,000 and $40,000?
The diameters of peaches in a certain orchard are normally distributed with a mean of 3.85 inches and a standard deviation of 0.42 inches. Show all work.
Identify each of the random variables as continuous or discrete.
Find the largest number of room reservations that this hotel can book and still be at least 95% sure that everyone who shows up at the hotel will have a room on a given night.
A sample mean, sample size, and population standard deviation are given. Use the P-value approach to perform a one-mean z-test about the mean of the population from which the sample was drawn.
Test the assumption that the more experienced consultant has higher satisfaction ratings at the 5% significance level. Show all steps.
If the rainfall was recorded on 20 (instead of 10) randomly selected days throughout the year, the standard error of the mean would be equal to?
You construct a 90% confidence interval for the average stock price to be (267.348, 279.472). Of the following choices, what is the approporiate interpretation of this interval?
Discuss the ability of the process to meet the customer's specifications. Also, if the customer seeks Six Sigma compliance, what are your recommendations?
The amount of corn chips dispensed into a 10 ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 10.5 ounces and a standard deviation of .2 ounces.
The thickness of a flange on an aircraft component is uniformly distributed between 0.95 and 1.05 millimeters. Determine the cumulative distribution function of flange thickness.
Find the roots of the quadratic equation:z^2-4z-12=0. (If there is more than one root, separate them with commas.)
Suppose a research firm conducted a study to determine the average amount of money steady smokers spend on cigarettes during a week.
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