lease answer question a and replace the sample section of 20 with 30.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Please answer question a and replace the sample section of 20 with 30.

5.66 Surface roughness of pipe. Refer to the Anti-Corrosion
Methods and Materials (Vol. 50, 2003) study of the sur-
face roughness of oil field pipes, Exercise 2.154 (p. 118).
Recall that a scanning probe instrument was used to
measure the surface roughness x (in micrometers) of 20
sampled sections of coated interior pipe. Consider the
sample mean, x.
...
RPIPE
a. Assume that the surface roughness distribution has a
mean of u = 1.8 micrometers and a standard deviation
of o = = .5 micrometer. Use this information to find the
probability that x exceeds 1.85 micrometers. 3264
b. The sample data are reproduced in the following table.
Compute x. 1.88
c. Based on the result, part b, comment on the validity of
the assumptions made in part a.
1.72 2.50 2.16 2.13 1.06 2.24 2.31 2.03 1.09 1.40
2.57 2.64 1.26 2.05 1.19 2.13 1.27 1.51 2.41 1.95
"Cent
Transcribed Image Text:5.66 Surface roughness of pipe. Refer to the Anti-Corrosion Methods and Materials (Vol. 50, 2003) study of the sur- face roughness of oil field pipes, Exercise 2.154 (p. 118). Recall that a scanning probe instrument was used to measure the surface roughness x (in micrometers) of 20 sampled sections of coated interior pipe. Consider the sample mean, x. ... RPIPE a. Assume that the surface roughness distribution has a mean of u = 1.8 micrometers and a standard deviation of o = = .5 micrometer. Use this information to find the probability that x exceeds 1.85 micrometers. 3264 b. The sample data are reproduced in the following table. Compute x. 1.88 c. Based on the result, part b, comment on the validity of the assumptions made in part a. 1.72 2.50 2.16 2.13 1.06 2.24 2.31 2.03 1.09 1.40 2.57 2.64 1.26 2.05 1.19 2.13 1.27 1.51 2.41 1.95 "Cent
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