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The GE company also makes light bulbs. They claim that their bulbs last an average of 750 hours, with a standard deviation of 20 hours.

The GE company also makes light bulbs. They claim that their bulbs last an average of 750 hours, with a standard deviation of 20 hours. A random sample of 64 light bulbs is taken.

Make sure the first find Z for each using z = (x -mean)/stdev

mean = 750

stdev=20

a. What is the probability that x > 750?

b. What is the probability that 745 < x < 755?

c. What is the probability that x < 735?

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