Answer:
The probability of a bulb lasting for between 480 and 526 hours=0.74454
Step-by-step explanation:
We are given that
Standard deviation of the lifetime,hours
Mean, hours
We have to find the probability of a bulb lasting for between 480 and 526 hours.
Hence, the probability of a bulb lasting for between 480 and 526 hours=0.74454
I didn't really get the which part because we shape it to serveral factors, this is one of them
Is there any more to the question? I cant give an answer based off of that!!
12+12m= 75+ 10m
2m = 63
M= 31.5