Question
Asked Nov 26, 2019
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A lightbulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the "life" of a lightbulb is normally distributed. 

determine the probability that a randomly selected lightbulb will last MORE than 1250 hours 

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Expert Answer

Step 1

It is given that, the mean and standard deviation are 1,000 and 150, respectively.

Step 2

The probability that a randomly selected light bulb will ...

x-u1250-1000
150
P(X1250) 1-P
250
=1-P z<
150
=1-P(z<1.67)
[From standar dnormal table]
=1-0.9525
0.0475
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x-u1250-1000 150 P(X1250) 1-P 250 =1-P z< 150 =1-P(z<1.67) [From standar dnormal table] =1-0.9525 0.0475

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