Extralite are testing a new long-life bulb. The lifetimes, in hours, are assumed to be normally dis- tributed with mean µ = 4650 and o = 400 (Round your answers to 4 decimal places): (a) Find the probability that a bulb chosen at random has a lifetime between 4250 and 4750 hours. (a) (b) Eztralite wish to quote a lifetime which will be exceeded by 99% of bulbs. What time, correct to the nearest 100 hours, should they quote? (b)

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Extralite are testing a new long-life bulb. The
lifetimes, in hours, are assumed to be normally dis-
tributed with mean u = 4650 and o = 400 (Round your
answers to 4 decimal places):
(a) Find the probability that a bulb chosen at random has a lifetime between 4250 and
4750 hours.
(a).
(b) Extralite wish to quote a lifetime which will be exceeded by 99% of bulbs. What time,
correct to the nearest 100 hours, should they quote?
(b)
Transcribed Image Text:Extralite are testing a new long-life bulb. The lifetimes, in hours, are assumed to be normally dis- tributed with mean u = 4650 and o = 400 (Round your answers to 4 decimal places): (a) Find the probability that a bulb chosen at random has a lifetime between 4250 and 4750 hours. (a). (b) Extralite wish to quote a lifetime which will be exceeded by 99% of bulbs. What time, correct to the nearest 100 hours, should they quote? (b)
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