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Suppose a brand of light bulbs is normally? distributed, with a mean life of 1100 hr and a standard deviation of 150 hr.
Find the probability that a light bulb of that brand lasts between 920 hr and 1295 hr.
Areas Under the Standard Normal Curve
z A z A
1.00 .3413 1.50 .43321.10 .3643 1.60 .44521.20 .3849 1.70 .4554 1.30 .4032 1.80 .46411.40 .4192 1.90 .4713
The probability that a light bulb will last between 920 hr and 1295 hr is ____.
?(rounded to four decimal places as? needed.)
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