Question 556814: Suppose that 5% of Americans are afraid of being alone in a house at night. If a random sample of 18 Americans is selected, find the following probability by using a binomial table. Give your final answer to three decimal places. There are exactly 4 people in the sample who are afraid of being alone at night.
Can someone please help! I am not good at word problems.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Suppose that 5% of Americans are afraid of being alone in a house at night. If a random sample of 18 Americans is selected, find the following probability by using a binomial table. Give your final answer to three decimal places. There are exactly 4 people in the sample who are afraid of being alone at night.
---
Binomial Problem with n = 18 and p(afraid) = 0.05
----
P(x = 4) = 18C4*0.05^4*0.95^14 = binompdf(18,0.05,4) = 0.0093
===================
Cheers,
Stan H.
===========
|
|
|
