A production line in a factory, assembles laptops. A random sample of assembly time of 49 laptops has been drawn from this factory. Suppose, the population distribution has a mean assembly time of 3o minutes and standard deviation 7 minutes. What is the assembly time that 90% of sample means are less than that time? [ Select one: a. None of the others b. 28.36 c. 31.28 d. 28.72 e. 31.64

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A production line in a factory, assembles laptops. A
random sample of assembly time of 49 laptops has been
drawn from this factory. Suppose, the population
distribution has a mean assembly time of 30 minutes and
standard deviation 7 minutes.
What is the assembly time that 90% of sample
means are less than that time? [
Select one:
a. None of the others
O b. 28.36
c. 31.28
d. 28.72
e. 31.64
Transcribed Image Text:A production line in a factory, assembles laptops. A random sample of assembly time of 49 laptops has been drawn from this factory. Suppose, the population distribution has a mean assembly time of 30 minutes and standard deviation 7 minutes. What is the assembly time that 90% of sample means are less than that time? [ Select one: a. None of the others O b. 28.36 c. 31.28 d. 28.72 e. 31.64
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