The test scores for the analytical writing section of a particular standardized test can be approximated by a normal​ distribution, as shown in the figure.   ​(a) What is the maximum score that can be in the bottom 10​% of​ scores? ​(b) Between what two values does the middle 80​% of scores​ lie?

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A: Solution: From the given information, confidence level is 0.98, σ=35.1 and E=2.

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Q: Question 1: A normal distribution has a mean of 0 and a standard deviation of 1. What percent of the…

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Q: Question #2 A normal distribution has a mean of 45 (μ = 45) and a standard deviation of 10. At what…

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A: Solution: From the given information, confidence level is 0.99, σ=71.3 and E=0.1.

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Q: The test scores for the analytical writing section of a particular standardized test can be…

A: Population mean μ=3.8, standard deviations σ=0.94 P(X<a)=10%  P(a<X<b)=80%

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Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

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Q: For a Normal distribution with μ=10.9μ=10.9 and σ=1.5σ=1.5, what proportion of observations have…

A: Given that μ=10.9 and σ=1.5 .