The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 900 hours and a standard deviation

Question

3 years ago

15

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 900 hours and a standard deviation

of 55 hours. Out of 720 freshly installed light bulbs in a new large building, how many would be expected to last between 800 hours and 1030 hours, to the nearest whole number?

Mathematics

1 answer:

max2010maxim [7] · Answer 1 · 2022-10-07T19:22:34+03:00

max2010maxim [7]3 years ago

7 0

Answer: 689

Step-by-step explanation: