A special purpose coating must have the proper abrasion. The standard deviation is known to be 21.
Question:
(a) Find the probability that the sample mean lies within 2 units of the population mean-that is, P[-2 < - μ < 2].
(b) Find the number k so that
P[-k < - u < k] = .90.
(c) What is the probability that X differs from p by more than 4 units?
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Step by Step Answer:
Since n 49 is large the distributio...View the full answer
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Related Book For 
Statistics Principles And Methods
ISBN: 9780470904114
7th Edition
Authors: Richard A. Johnson, Gouri K. Bhattacharyya
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