SOLUTION: the daily sales of a particular item at branch of Sue's supermarket are normally distributed with a mean of 600 units and a standard deviation of 50 units estimate the probabilit

Question 861877: the daily sales of a particular item at branch of Sue's supermarket are normally distributed with a mean of 600 units and a standard deviation of 50 units
estimate the probability that on a day chosen at random the number of units sold will be more than 680
Found 2 solutions by ewatrrr, stanbon:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi
z = (680-600)/50 = 1.6 invNorm(1.6) = .9452
P(z > 680) = 1 - .9452 = .0548 0r 5.48%
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
normally distributed with a mean of 600 units and a standard deviation of 50 units
estimate the probability that on a day chosen at random the number of units sold will be more than 680
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z(680) = (680-600)/50 = 80/50 = 1.6
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Ans: P(x > 680) = P(z > 1.6) = normalcdf(1.6,100) = 0.0548
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Cheers,
Stan H.
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