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The life of an electronic transistor is normally distributed, with a mean of 500 hours and...

The life of an electronic transistor is normally distributed, with a mean of 500 hours and a standard deviation of 80 hours.

a. Determine the probability that a transistor will last for more than 400 hours.

b. Determine the probability that a transistor will be between 360 hours and 600 hours.

c. Determine the probability that a transistor will be less than 340 hours.

Math   Statistics-And-Probability   
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