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Suppose the scores for a college entrance exam follow a normal distribution with mean 480. You are told that 95% of the scores range between 300 and 660. Using the 68, 95,99.7 rule, what is the standard deviation of exam scores?
Determine the mean and the standard deviation of the sample.
Compute lower and upper quartiles of log10-balances? Determine 95% range of the balances in $s? Express in English what the two boundaries mean.
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
What is the p value? Describe the steps in formal hypothesis testing. Make at least one comment for each step.
Assume the cholesterol levels of adult American women are normally distributed with a mean of 190 mg/dL and a standard deviation of 26 mg/dL. What percent of adult women do you expect to have cholesterol levels at least 200 mg/dL?
If she has chosen the first weeks rides, how many ways can she choose four more different rides for the second week? Assume that order does not matter.
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
Decide whether the normal sampling distribution can be used. If it can be used, test the claim about the population proportion p at the given level of significance α using the given sample statistics.
What is the probability of selecting someone at random from this population who has a cholesterol value less than 180? What is the mean and the standard deviation (error) of?
Converting data to indexes makes it easier to compare the trend in a series composed of exceptionally large numbers.
Find out the probability that: (a) The amount requested is between $65,000 or more?
Use the normal approximation to find the probability that the student scores 70% or lower on a 100-question test.
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