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Long term testing of concrete shows that the mean strength (u) is 3500 psi with a standard deviation (o) of 400 psi. (a) Assuming a normal distribution, use the standard normal table provided to find the probability P(x) that concrete strength is at least 3000 psi. P(x ≥ 3000) = Z = X - H 050 b) If 25 samples of concrete are tested, find the probability P(x) that the sample mean is at least 3540 psi.

Long term testing of concrete shows that the mean strength (u) is 3500 psi with a standard deviation (o) of 400 psi. (a) Assuming a normal distribution, use the standard normal table provided to find the probability P(x) that concrete strength is at least 3000 psi. P(x ≥ 3000) = Z = X - H 050 b) If 25 samples of concrete are tested, find the probability P(x) that the sample mean is at least 3540 psi.

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.CR: Chapter 13 Review
Problem 29CR
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4. Long term testing of concrete shows that the mean strength (u) is 3500 psi with a standard deviation (o) of 400 psi. (a) Assuming a normal distribution, use the standard normal table provided to find the probability P(x) that concrete strength is at least 3000 psi. Z = X - μ O 3x)²), (c) + (22 / 3y)²), (6₂³) P(x ≥ 3000) (b) If 25 samples of concrete are tested, find the probability P(x) that the sample mean is at least 3540 psi. Z = √n (x-µ) O P(x ≥ 3540) =
Transcribed Image Text:4. Long term testing of concrete shows that the mean strength (u) is 3500 psi with a standard deviation (o) of 400 psi. (a) Assuming a normal distribution, use the standard normal table provided to find the probability P(x) that concrete strength is at least 3000 psi. Z = X - μ O 3x)²), (c) + (22 / 3y)²), (6₂³) P(x ≥ 3000) (b) If 25 samples of concrete are tested, find the probability P(x) that the sample mean is at least 3540 psi. Z = √n (x-µ) O P(x ≥ 3540) =
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