Find the following probabilities for test scores X, for which the mean is 400 and the standard deviation is 90. Assume that the test scores are described by a normal curve. (Round all answers to four decimal places.) (a) P(X less than or equal to 400). (b) P(X less than or equal to 490). (c) P(X greater than or equal to 580).
Find the following probabilities for test scores X, for which the mean is 400 and the standard deviation is 90. Assume that the test scores are described by a normal curve. (Round all answers to four decimal places.) (a) P(X less than or equal to 400). (b) P(X less than or equal to 490). (c) P(X greater than or equal to 580).
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 22PFA
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Find the following probabilities for test scores X, for which the mean is 400 and the standard deviation is 90. Assume that the test scores are described by a normal curve. (Round all answers to four decimal places.)
(a) P(X less than or equal to 400).
(b) P(X less than or equal to 490).
(c) P(X greater than or equal to 580).
(d) P(400 less than or equal to X less than or equal to 580).
(b) P(X less than or equal to 490).
(c) P(X greater than or equal to 580).
(d) P(400 less than or equal to X less than or equal to 580).
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