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A company produces bolts for large-scale construction projects. The shear strength, X, of the bolts is assumed to be a normally distributed variable with a mean strength u=500kg and a standard deviation 10kg. That is, X~N(500, 10). Any bolt that breaks at a load less than 479kg is considered to be defective according to the company's warranty policy. Any defective bolt will be replaced free of charge, along with another free bolt. What percentage of the company's bolts will need to be replaced based on this policy?
Suppose this player gets to shoot three free throws. Find the probability that he makes at least one of the three consecutive free throws.
A manufacturer can typically process 176-264 devices a given period of concern. In this situation the processing event is either pass or fail.
You just saw an ad on television that states the majority of the population would vote to make smoking illegal. The poll that is referenced shows 53% of those asked supported making smoking illegal.
The largest salary on the list is $100,000 and is accidentally changed to $1,000,000. What is the new standard deviation?
People who answered incorrectly, 26 are men. The question was given to an equal number of men and women all with the same IQ. Find the probability that among 120 wrong answers, at least 82 made by men.
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
At a fair run by a local charity organization, it costs 50 cents to try one's luck in drawing an ace from a deck of 52 playing cards. What is the expected profit per customer
Find the probability that the carbon monoxide concentration exceeds 9 ppm during a randomly selected one-hour period.
the distribution of weekly salaries at a large company is right skewed with a mean of 1000 and a standard deviation of
Determine the correlation coefficient. Is there a strong relationship? If so determine the line of best fit. Estimate what the sales should be for a 3000 square foot shop.
Find the critical value to test the claim that all ages have crash rates proportional to their driving rates. That all ages have crash rates proportional to their driving rates.
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
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