The cost of textbooks is normally distributed with a mean of $214. You do not know the population standard deviation, but you know the sample standard deviation to be $40. What is the probability that from a sample of 7 textbooks, their average cost will be greater than $245? (Report answer accurate to three decimal places.)

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A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

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Q: On the planet of Mercury, 4-year-olds average 3.1 hours a day unsupervised. Most of the unsupervised…

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Q: On the planet of Mercury, 4-year-olds average 2.8 hours a day unsupervised. Most of the unsupervised…

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.