What is the probability all three flights arrive on time
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Consider the following frequency of demand: If the simulation begins with 0.8102, the simulated value for demand would be
The average charitable contribution deduction on federal tax returns for the year 2007 was $625. Suppose that the distribution of contributions is normal with a standard deviation of $100.
Use the normal approximation to the binomial to find the probability of X = 20 when n = 30 and p = 0.5.
A scientist attempts to perform a difficult experiment. She is successful in about 80% of her attempts. She attempts the experiment 6 times. Let X is the number of these attempts that succeed. Find the mean and the variance of X.
You take a trip by air that involves three independent flights. If there is an 77 percent chance each specific leg of the trip is done on time, what is the probability all three flights arrive on time?
In pharmacological research a variety of clinical chemistry measurements are routinely monitored closely for evidence of side effects of the medication under study. Suppose typical blood-glucose levels are normally distributed, with mean = 90mg/dL
Twelve case of leukemia are reported in people living in a particular census tract over a 5 year period. Is the number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
Calculate the confidence interval for the proportion of respondents who stated they are former smokers.
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