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20068088
06.08.2019 •
Mathematics
Based on a survey of 32 randomly selected employees (anonymously, of course) the company has determined that the average amount of time spent texting over a one-month period is 173 minutes with a standard deviation of 66 minutes. what is the probability that the average amount of time spent using text messages is more than 199 minutes
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Ответ:
0.0129
Step-by-step explanation:
Given : Sample size : n=32
The average amount of time spent texting over a one-month period is :![\mu=173\text{ minutes}](/tpl/images/0172/2532/ee098.png)
Standard deviation :![\sigma=66\text{ minutes}](/tpl/images/0172/2532/bf96d.png)
We assume that the time spent texting over a one-month period is normally distributed.
z-score :![z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}](/tpl/images/0172/2532/8785d.png)
For x= 199
Now by using standard normal table, the probability that the average amount of time spent using text messages is more than 199 minutes will be :-
Hence, the required probability = 0.0129
Ответ:
thx!
Explanation: