SOLUTION: The diameters of steel disks produced in a plant are normally distributed with a mean of 2.5 cm and standard deviation of .02 cm.
Find the following probabilities that a disk pic
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-> SOLUTION: The diameters of steel disks produced in a plant are normally distributed with a mean of 2.5 cm and standard deviation of .02 cm.
Find the following probabilities that a disk pic
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Question 1157814: The diameters of steel disks produced in a plant are normally distributed with a mean of 2.5 cm and standard deviation of .02 cm.
Find the following probabilities that a disk picked at random has a diameter:
• Smaller than 2.58 cm
• Between 2.54 and 2.58 cm Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
(2.58-2.5)/0.02 is +4
probability of z<4 is 1.0 to four decimal places.
between 2.54 and 2.58 will be the probability z is between 2 and 4
go to 2nd VARS 2 for normalcdf (you almost never want normalpdf)
enter 2,4
hit enter'
0.0228 is the probability.
