Question 353663
A bakery shop sells loaves of fresh French bread. Any unsold loaves at the end of the day are either discarded or sold elsewhere at a loss. The demand for this bread has followed a normal distribution with mu = 35 loaves and sigma = 8 loaves. 
a) If 40 loaves are to be made each day, what is the probability of not meeting demand?
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z(40) = (40-35)/8 = 0.6250
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P(x > 40) = P(z > 0.6250) = 0.2660
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b) How many loaves should the bakery make each day so that they can meet the demand 90% of the time?
Find the z-value with a left tail of 90%
invNorm(0.9) = 1.2816
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Find the corresponding x value:
x = 1.2816*8+35 = 45.25 loaves
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c) What is the probability of exceeding 38 loaves, given that the demand exceeds????
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Cheers,
Stan H.