alfabetagamma
New member
- Joined
- Feb 21, 2019
- Messages
- 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.