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The random variables X and Y have expected values 8 and 25, standard deviations 4 and 9, respectively.
(a) Calculate the expected value and standard deviation of 8 - 3X.
(b) Calculate the expected value and standard deviation of 7X-2Y+15 when X and Y are independent.
Assume that the probability of a defective computer component is 0.2. Find the probability that the first defecr is found in the fifth component tested.
Twenty subscribers were surveyed, it found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979.00. The standard deviation of the sample was $1000.00.
An orange juice producer buys only one kind of oranges. The amount of juice squeezed from each of these oranges is approximately normally distributed with a mean of 4.2 ounces and a population standard deviation of 1 ounce.
Calculate all measures of central tendency for data that are interval or ratio in measurement. Calculate the standard deviation for data that are interval or ratio in measurement
Fair die is rolled 10 times. Determine the probability that the odd number (1, 3 or 5) will occur less than 4 times?
Florida consumers are confident about the economy. verify the 90% confidence interval. State in a sentence the meaning of the derived confidence interval .494, .568. What would be your conclusion?
15% of the south district students failed, and 5% of the central district students failed. Develop a probability tree showing all marginal, conditional, and joint probabilities.
An insurance company sells $300 deductible annual automobile insurance policies to a certain category (age, driving records) for $1000.00 The insurance company has set four different accident types
If a group of 400 school children are selected at random, what is the probability that at most 70 children will miss school because of asthma?
Construct a 90% two-sided confidence interval onthe difference between the proportion nonconforming in processes 1 and 2. Based on this confidence interval, can you conclude at a significance level of 10% that the difference is not equal to 10%? W..
The following data from a sample of 100 families show the record of college attendance by fathers and their oldest sons: in 22 families, both father and son attended college; in 31 families, neither father nor son attended college; in 12 families,..
The heights of children 2 years old are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches. Pediatricians regularly measure the heights of toddlers to determine whether there is a problem.
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