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Floppy Disks - Normal Distribution

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The Floppy Disk Company makes 3.5" floppy disks for disk drives that are 3.7" wide. The size of the manufactured disk is normally distributed with a standard deviation of 0.1". The company manufactures 1000 disks every hour.

a. What percentage of the disks would you expect to be greater than 3.7"?

b. In one hour, how many disks would you expect to be between 3.4" and 3.7"?

c. About how many disks will be unable to fit in the disk drive?

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