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assume that the number of days it takes a homebuilder to complete a house is normally...

assume that the number of days it takes a homebuilder to complete a house is normally distributed with an average completion time of 176.7 days and a standard deviation of 24.8 days. Determine the completion time that the builder has a 40% probabilty of acheiving.
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Answer #1
mean μ= 176.7
standard deviation σ= 24.8000
for 40th percentile critical value of z= -0.25
therefore corresponding value=mean+z*std deviation= 170.50 days
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