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
A.) .6 or 60%
b.) .66 or 66%
Answer:
Closet #1.
Step-by-step explanation:
Closet #1 is 4x5x8, right? so, 4x5=20, and 20x8=160 feet. Closet #2 is 6x3x8, and 6x3 is 18. That's already less than 20 even before we multiply by 8. So, the answer to your question is Closet #1.
The expression should be (2/h)x(k+8).