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1. A college requires applicants to have an ACT score in the top 15 % of all test scores . The ACT scores are normally distributed , with a mean of 17 and a standard deviation of 3.24 . Find the lowest test score that a student could get and still meet the college 's requirement?
2.With the conditions of problem 1, if 20 students are selected , what is the probability that the mean of their scores is greater than 18?
given the probability that james will go the gym after work is 28 and the probability that sam will go the gym after
In a certain town, 30% of adults have a college degree. The accompanying table describes the probability distribution for the number of adults (among 4 randomly selected adults) who have a college degree. Find the standard deviation for the probab..
Find a 95% confidence interval for the true mean amount that citizens spend per year. What do you think the lowest possible mean amount spent per year is? Why?
the probability that a certain kind of scratch-off lottery ticket will win a prize is 0.22. kendra received 8 tickets
A random sample of 61 accounts were checked. The standard deviation was $286.20. At α= 0.01, test the firms' assumption. Assume the account balances are normally distributed.
Interpret the results at α = .01. (c) Is normality assured? (d) Is the difference large enough to be important? (e) What else would medical researchers need to know before prescribing this drug widely?
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.
Give an example of a null and alternative hypotheses. This can be a personal item or something at work. Additionally, identify the Type I and Type II Errors that could occur with your decision-making process.
Compute the Cumulative incidence of stroke in the study and compute the Cumulative incidence of stroke in patients classified as hypertensive at baseline
the following data show the daily closing prices in dollars per share for a stock. period price 1 82.87 2 83.00 3
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
Pprobability is no greater than 1% that the day's supply is exhausted. How many pounds of ground beef should the manager have available for use each day?
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