Answer:

Step-by-step explanation:
3+5=8
8÷8=1
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
Answer:
Step-by-step explanation:

23.83 your welcome goooooooood
Quick question, why didn't you just use the calculator on the device you took this photo with? Anyway, the answer is 5.62