In a recent year, the scores for the reading portion of a test werenormally distributed, with a mean of 20.9 and a standard deviation of 6.5.Complete parts (a) through (d) below....(a) Find the probability that a randomly selected high school student who tookthe reading portion of the test has a score that is less than 18.The probability of a student scoring less than 18 is(Round to four decimal places as needed.)

X~N( μ , ?)μ=20.9 , ?=6.5Z-score =( x - μ )/?

Answered: In a recent year, the scores for the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 71and a standard deviation of 8. Grades are assigned such that the top 10% receive A's, the next 20% received B's, the middle 40% receive C's, the next 20% receive D's, and the bottom 10% receive F's. Find the lowest score on the final exam that would qualify a student for an A, a B, a C, and a D.

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