Math Help - Data Management - Probability Distributions

1. Data Management - Probability Distributions - SOLVED

Sonic pizza delivers 80% of its pizza on time. What is the prob that its first 4 pizzas will be late on any given day?
Ok so the prob. of success is 80% 0.8 and failure is 20% 0.2...

I need to find the prob. which happens to be $P(X) = q^x p$

I am really stuck at that part....

2. Originally Posted by Faisal2007
Ok so the prob. of success is 80% 0.8 and failure is 20% 0.2...

I need to find the prob. which happens to be $P(X) = q^x p$

I am really stuck at that part....
You're not told anything except that the first 4 deliveries are late. So the probability is (0.2)^4, assuming that each delivery is independent.

3. I have been trying that for a long time...

the only choices i have are 0.1296
0.05184
0.00128
0.0016
None

I guess it none of the above.

Thanks alot sir.