# Question

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 percent?

(b) Lower 75 percent?

(c) Lower 1 percent?

(d) Middle 90 percent?

(a) Upper 50 percent?

(b) Lower 75 percent?

(c) Lower 1 percent?

(d) Middle 90 percent?

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