cuki96
27.04.2021 •
Mathematics
The lifetime of a certain type of calculators is normally distributed. If the mean is 400 hours and the standard deviation is 50 hours, for a group of 5000 batteries, how many are expected to last
1.between 350 hrs to 450 hours
2.more than 300 hours
3.less than 300 hours
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Ответ:
Option C
Step-by-step explanation:
Circumference of a circle is:
r - radius
We are given the radius of 3 inches.
Option C should be the correct answer.
Hope this helps!