MATH1P98D02FW2016.sp15ds.WeBWorK_Assignment_3v2

MATH1P98D02FW2016.sp15ds.WeBWorK_Assignment_3v2 - Shreya...

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Shreya Rakeshkumar Patel MATH1P98D02FW2016 Assignment WeBWorK Assignment 3 due 10/29/2016 at 06:35pm EDT Problem 1. 5. (1 pt) Suppose the random variable x is best described by a normal distribution with μ = 20 and σ = 7 . 7. Find the z -score that corresponds to each of the following x val- ues. (a) x = 21 z = (b) x = 10 z = (c) x = 13 z = (d) x = 38 z = (e) x = 28 z = (f) x = 33 z = Answer(s) submitted: 0.1298701299 -1.298701299 -0.9090909091 2.337662338 1.038961039 1.688311688 (correct) Correct Answers: 0.12987012987013 -1.2987012987013 -0.909090909090909 2.33766233766234 1.03896103896104 1.68831168831169 Problem 2. 4. (1 pt) Cars arriving for gasoline at a Shell station follow a Poisson distribution with a mean of 4 per hour. Determine the probability that over the next hour, only one car will arrive. Probability = Answer(s) submitted: 1.471517765 (incorrect) Correct Answers: 0.0732625555549367 Problem 3. 1. (1 pt) x 18 19 20 21 22 P ( x ) 0 . 2 0 . 1 0 . 2 0 . 1 0 . 4 Given the discrete probability distribution above, determine the following: (a) P ( x 21 ) = (b) P ( x < 22 ) = (c) P ( x 21 or x < 19 ) = Answer(s) submitted: 0.6 0.6 0.7 (correct) Correct Answers: 0.6 0.6 0.7 Problem 4. 6. (1 pt) Use a Standard Normal Table to find the z-score that satisfies each of the following statements. (a) The point z with 4.09 percent of the observations falling below it.

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