Probability question

alfabetagamma

New member
Joined
Feb 21, 2019
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2
For a certain type of laptops,the length of time between charges of the battery is normally distributed with a mean of 30 hours and a standard deviation of 12 hours.John owns one of these laptops and wants to know the probability that the length of time will be differ from the population mean by at most 2 populations standard deviation.
 

Dr.Peterson

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Joined
Nov 12, 2017
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3,078
Please tell us what you know about the normal distribution, and what method you have been taught to solve problems with it (e.g. a table, software, a few memorized numbers like 68%, ...). The more you can show of your work, the better we can tailor our help to your needs.

This summary of our submission guidelines will clarify what I am asking of you.

I will tell you that this particular problem can be answered with little more than a number I have memorized.
 
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