Question

-2)(EZE
8.
CFL bulbs of a certain make have a mean life of 800
hours with S.d. of 150 hours. Out of 50 thousand bulbs
of that make used for street lighting, how many of them
would fuse in first 650 hours, if the distribution of the life
of bulbs is assumed to be normal? How many bulbs
would still be burning after 950 hours?
(Given : Area of normal curve 0 and 1 is 0.34134)

Answer 1

Answer:

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