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A typing competency test yields scores which are normally distributed with a mean of 80 and a standard deviation of 10. Approximately what percentage of the test scores fall between 70 and 100?
the lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. random
suppose you as the manager of austin bbq ribs would like to develop a 95 ci for the number of customers who will enter
Another location if it meant a substantial promotion. Based on these findings, write a brief note to management regarding all executives in the firm.
Calculate the mean, median of the following grade point averages
conduct a one-tailed hypothesis test given the information below.a manufacturer wants to increase the shelf life of a
With standard deviation of 15. Test hypothesis that Mrs. Smith and Mrs. Jones are equally effective teachers. Use 0.10 level of significance.
at a certain college it is estimated that at most 25 of the students ride bicycles to class. does this seem to be a
the dice game craps is played as follows. the player throws two dice and if the sum is seven or eleven then she wins.
q1. a survey was conducted in five countries.the percentages of respondents who said that they eat out once a week or
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
If the mean number of small business failures per month is 10, what is the probability that exactly four small businesses will fail during a given month?
An automobile assembly line operation has a scheduled mean completion time,u , of 12.6 minutes. The standard deviation of completion times is 1.8 minutes.
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