Mathematics, 27.05.2020 23:10 peytonbrien2002
A certain brand of refrigerator has a useful life that is normally distributed with mean 10 years and standard deviation 3 years. The useful lives of these refrigerators are independent. Calculate the probability that the total useful life of two randomly selected refrigerators will exceed 1.9 times the useful life of a third randomly selected refrigerator.
Answers: 1
and 
are two randomly selected refrigerator's life whose sum will exceed third selected refrigerator 
.
![z=\dfrac{X-E[x]}{\sqrt{Var[x]}}=\dfrac{0-1}{7.0156315694}\approx-0.14](/tpl/images/0667/8552/7a315.png)
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