Question 1116669: The population means and standard deviation are given below. Find the required probability and determine whether the given sample mean would be considered unusual.
For a sample of n equals 70, find the probability of a sample mean being less than 19.5 if u equals20 and o equals1.19.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The population means and standard deviation are given below. Find the required probability and determine whether the given sample mean would be considered unusual.
For a sample of n equals 70, find the probability of a sample mean being less than 19.5 if u equals 20 and o equals 1.19.
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z(19.5) = (19.5-20)/(1.19/sqrt(70)) = -3.5154
P(x-bar < 19.5) = P(z < -3.5154) = normalcdf(-100,-3.5154) = 0.0002196
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Cheers,
Stan H.
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