The weight of 400 trucks traveling on a particular section of I-475 has a popula
ID: 3322232 • Letter: T
Question
The weight of 400 trucks traveling on a particular section of I-475 has a population mean of 15.0 tons and a population standard deviation of 4.2 tons. What is the standard error of the means ? What is the probability a state highway inspector selecting a sample of 64 trucks finds the sample mean to be equal to 20 tons ? The weight of 400 trucks traveling on a particular section of I-475 has a population mean of 15.0 tons and a population standard deviation of 4.2 tons. What is the standard error of the means ? What is the probability a state highway inspector selecting a sample of 64 trucks finds the sample mean to be equal to 20 tons ? The weight of 400 trucks traveling on a particular section of I-475 has a population mean of 15.0 tons and a population standard deviation of 4.2 tons. What is the standard error of the means ? What is the probability a state highway inspector selecting a sample of 64 trucks finds the sample mean to be equal to 20 tons ?Explanation / Answer
= 15
= 4.2
n = 400
a) standard error = / sqrt(n) = 4.2 / sqrt(400) = 0.21
b) n = 64
P(x bar = 20) = 0
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