Question 386068
The lifetime of a Duracell AAA battery is normally distributed with a mean M=28.5 hours and standard deviation baby sigma= 5.3 hours. Compute z scores to determine for a battery selected at random, what is the probability is that the lifetime will be
a.) 25 hours or less
z(25) = (25-28.5)/5.3 = -0.6604
P(x <= 25) = P(z <= -0.6604) = 0.2545
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Cheers,
Stan H.
b.) 34 hours or more
Prob = 0.1497
c.) between 25 hours and 34 hours.
Prob = 0.5960
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Cheers,
Stan H.
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