Cars make up 70% of a country's registered vehicles. Consider a random sample of 20 vehicles.
What is the probability that all are cars?
The binomial probability table I'm using only goes up to p = 0.5 and for this question p = 0.7%
Here's what I've come up with:
P(X = x), so x is 20 = P(Y = 20 - 20), so Y is 0. Y ~ B(20, 0.3) - I did 1 minus 0.7. So I find that on the table and the answer is 0. So is that the answer?