Asked by Tom gordy

If light bulbs are normally distributed with a mean of 2500 hrs. and a standard deviation of 500 hrs. what percentage of light bulbs have a life span less than 2500 hrs.?
Answered by Kuai

z = (score -mean)/sd
z = (2500 -2500)/500
z = 0 is 50%
Answered by lana
23
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