Author Question: A study of college dropouts models the number of undergraduate credits a student successfully earns ... (Read 15 times)

acwiles · **on:** Feb 26, 2023

Question 1

A sample of recorded dog barks is analyzed for decibel intensity. The mean intensity is 62.25 decibels, with a variance of 4.45. If this data set is normally distributed, we would expect approximately 95% of the barks to be within what range?

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(58.03, 66.47)

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(60.16, 64.36)

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(55.92, 66.47)

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(53.35, 71.15)

Question 2

A study of college dropouts models the number of undergraduate credits a student successfully earns prior to quitting using an exponential random variable. If the observed average number of credits earned is 22.5, what proportion of students drop out with more than 100 credits, assuming an exponential random variable is appropriate here?

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0.0117

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0.0392

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0.9802

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0.2250

jojomac20 · **Reply #1 on:** Feb 26, 2023

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