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The lifetime of a color television picture tube is normally distributed with the mean of 7.8 years and a standard deviation of 3 years.
a. What is the probability that a picture tube will last more than ten years?
b. If the firm guarantees the picture tube for 2 years, what percentage of the television sets sold will have to be replaced because of the picture tube failing?
c. How long should the warranty period be (in years) if they want to replace only 1% of the television picture tubes?
In the history class the mean score was 76 with standard deviation 3.
Fifty raffle tickets are numbered 1 throughout 50, and one of them is drawn at random. What is the probability that the number is a multiple of 5 or 8? Consider the following "solution": Since 10 tickets bear numbers that are multiples of 5 and 6 ..
In a sample of 1200 police officers, the mean annual salary was $33,000 and the standard deviation was $3200. A random sample of size 70 is drawn from this population. What is the probability that the mean annual salary is between $32,000 and $32,..
Plot the data on the same line and give your impression regarding any apparent differences between the two companies.
If the pilot plant fails, Rob feels the chance of the full-scale facility succeeding is only 20%. The probability that the pilot plant will succeed is estimated at 0.6. Structure this problem with a decision tree and advise Rob what to do.
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
Explain the strength of relationship between the assets?
A sample of approx 25 students enrolled in the university points out that X (bar) = $315.4 and s = $43.20.
Test whether the gender distribution for basketball fans is significant different from general college by proportion test.
Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
Find out the expected winnings for a person who buys one ticket.
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