1. Flash floods occur in Hill Valley at a Poisson rate of 2 per year. a: What is the expected waiting time for the next Flash floods?
b. Find the probability that the waiting time for the next Flash flood is between 12 and 18 months.
c: If the last Flash floods in Hill Valley occurred 4 months ago, then what is the probability that the next Flash floods doesn't occur within the next 5 months?
d. Find the 75th percentile for the waiting time between Flash floods in Hill Valley?
e: Find the probability that the waiting time for the next 4 Flash floods is between 12 and 18 months?
f. Find the 99th percentile for the waiting time for the next 4Flash floods?

the ratio of white tiles to blue tiles is 48: 16. the ratio in it's simplest form is 3: 1.

step-by-step explanation:

ratio: take the first number and add a colon next to it, then add the second number after that. make sure the ratio order matches up with the written problem!

simplest form: we can simplify the ratio 48 : 16 by dividing both terms by the greatest common factor (gcf).

the gcf of 48 and 16 is 16.

divide both terms by 16:

48 ÷ 16 = 3

16 ÷ 16 = 1

reducing to simplest form:

48 : 16 = 3 : 1

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.

30,40,50 is correct answer