keshan3000
18.05.2021 •
Mathematics
Please help me asap
The batteries from a certain manufacturer have a mean lifetime of 890 hours, with a standard deviation of 90 hours. Assuming that the lifetimes are normally
distributed, complete the following statements.
(a) Approximately 95% of the batteries have lifetimes between___hours and___
hours.
(b) Approximately _?_
of the batteries have lifetimes between 620 hours and 1160 hours.
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