61 701
Assignments Done
Successfully Done
In May 2018

Answer to Question #419 in Statistics and Probability for Tony

Question #419
Observations have shown that in some areas in September there are 12 rainy days in average. What is the probability that out of eight randomly taken days in this month three days will be rainy?
Expert's answer
There are 30 days in September. Thus, 8 days can be selected in N = (C30)^8 different ways. There are 12 rainy days, thus, there are 18 not rainy days. We are interested in situation when there are 3 rainy and 5 not rainy days among 8 randomly taken days.

3 rainy days can be selected out of 12 rainy days in (C12)^3 ways. 5 clear days can be selected out of 18 clear days in (C18)^5 ways. The total number of ways to select 3 rainy and 5 clear days is: m = (C12)^3 *(C18)^5.

Thus, the probability of having exactly 3 rainy days in the selection is: P = m/N = ((C12)^3 *(C18)^5)/(C30)^8 ≈ 0.322.

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!


No comments. Be first!

Leave a comment

Ask Your question

Privacy policy Terms and Conditions