In a recent year, the scores for the reading portion of a test were normally distributed, with a mean of 22.2 and a standard deviation of 6.3. Complete parts (a) through (d) below. (a) Find the probability that a randomly selected high school student who took the reading portion of the test has a score […]
Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $63,000. A random sample of 35 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $60,500? Assume σ […]
A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confidence assuming σ.9? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? A 99% confidence […]
Use the normal distribution of fish lengths for which the mean is 10 inches and the standard deviation is 4 inches. Assume the variable x is normally distributed. a.What percent of the fish are longer than 11 inches? b.If 300 fish are randomly selected, about how many would you expect to be shorter than 7 […]
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