# (Solved) The scores of students on the ACT college entrance examination in a recent year had a normal distribution with mean 17.7 and standard deviation 4.

3...The scores of students on the ACT college entrance examination in a recent year had a normal distribution with mean 17.7 and standard deviation 4.Â  What ACT score should a student have in order to be in the top 10% of test takers? (use 3 decimals

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1...Find the z score such that the 45% of observations in a standard normal distribution are greater than z.

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2...Based on historical data, a manufacturing company that produces glass bottles estimates the the proportion of defective bottles is 58%. Suppose a random sample of 660 bottles is sampled randomly from this population. What is the probability that the proportion of defective bottles in the sample is between 55% and 65% ?

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This question was answered on: Mar 27, 2022

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