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Of the bolts manufactured for a certain application, 90% meet the length specification and can be used immediately, 6% are too long and can be used after being cut, and 4% are too short and must be scrapped.
a. What is the probability that a randomly selected bolt can be used?b. What is the probability that fewer than 9 out of 10 bolts can be used?c. What is the probability that exactly 9 out of 10 bolts can be used immediately?
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
A common error is neglecting to get ranked data for some statistical processes. Why do we have to have ranked data? Give an example of where you would need ranked data.
Sketch curves representing the distribution of the original population and the sampling distribution of x for a sample of size n+16.
Find the probability that the family's monthly gasoline purchases will be between 80 and 90 gallons. Find the probability that the family's monthly gasoline purchases will be less than 75 gallons.
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
Determine the first two cumulants also the ratio between the standard deviation and average energy. Explain why distribution becomes extremely narrow.
Compute the optimal production quantities for the company?
The survey reported that 31% of the respondents feel they have to save more for retirement to make up for what they lost. Develop a 95% confidence interval for the population proportion.
Of 970 subjects, 20 answered yes and 950 answered no. find p^, the proportion of the sample who were victims. Find the standard error of this estimate.
Seventy-five percent of households say they woud feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings.
A silver dollar is flipped twice. Calculate the probability of each of the following occurring:
In a column, write the sample space for the experiment that consists of observing the day's production.
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