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
calculate the percentage increase,work out the difference (increase) between the two numbers you are comparing. Then divide the increase by the original number and multiply the answer by 100.
520-500 = 20
20÷500 =.04
.04 ×100= 4%
Answer:
6:8
Step-by-step explanation:
Hope it helps
First, let's convert the mixed fraction into an improper fraction:
2 3/8 = 21/8
21/8 * 400 = 8400/8
8400/8 = 1050
It will cover 1050 square ft.
4 x 7= 28
BTW no calculator. Did it in my head. Hope this helps!