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For the normal distribution of burning times of electric light bulbs with a mean equal to 1200 hours and a standard deviation equal to 120
For the normal distribution of burning times of electric light bulbs with a mean equal to 1200 hours and a standard deviation equal to 120 hours, what burning time is identified with the
a. upper 50%?
b. lower 75%?
c. Lower 1%?
d. Middle 90 %?
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