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Over the past 10 years, the local school district has measured physical fitness for all high school freshmen. During that time, the average score on a treadmill endurance task has been u = 19.8 minutes with a standard deviation of o = 7.2 minutes. Assuming that the distribution is approximately normal, find each of the following probabilities,
a. What is the probability of randomly selecting a student with a treadmill time greater than 25 minutes? In symbols, p(X = 25) = ?
b. What is the probability of randomly selecting a student with a time greater than 30 minutes? In symbols, p(X > 30) = ?
c. If the school required a minimum time of 10 minutes for students to pass the physical education course, what proportion of the freshmen would fail?
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Goranson and Hall (1980) explain that the probability of detecting a crack in an airplane wing is the product of p1, the probability of inspecting a plane with a wing crack; p2, the probability of inspecting the detail in which the crack is locate..
a. Find the missing values in the ANOVA table. b. At the 5% significance level, can you conclude that average growth of the plant differs by organic fertilizer
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you measure the lifetime of a random sample of 64 tires of a certain brand. the sample mean is x 50 months. suppose
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Create a tree diagram for this situation.- Create a "hypothetical hundred thousand" table for this situation.- Using the tree diagram from part (a) or the table from part (b), find the percent of customers who are no-shows.
Determine whether the binomial distribution is an appropriate model for the probability distribution of the given experiment.
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