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The diameters of ball bearings are known to be normally distributed with mean 6.15 cm standard...

The diameters of ball bearings are known to be normally distributed with mean 6.15 cm standard deviation 0.72 cm. Find the probability that a randomly selected ball bearing has a diameter less than 6.25 cm. Find the probability that a randomly selected ball bearing has a diameter greater than 6.50 cm. Find the diameters a and b such that the middle 80% of ball bearing diameters are between a and b.

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