Mathematics, 13.11.2019 03:31, svarner2001
The average time taken to complete an exam, x, follows a normal probability distribution with mean = 60 minutes and standard deviation 30 minutes.
what is the probability that a randomly chosen student will take more than 30 minutes to complete the exam?
select one:
a. 0.9772
b. 0.8413
c. 0.5
d. 0.1587
Answers: 3
and 
.![P(x30)=P(z\dfrac{30-60}{30})\ \ [\because\ z=\dfrac{x-\mu}{\sigma} ]\\\\=P(z-1)=P(z-z)=P(Z](/tpl/images/0371/7294/fc2e3.png)
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The average time taken to complete an exam, x, follows a normal probability distribution with mean =...
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