About 55% of emergency room visits are unnecessary. Assuming each emergency room visit is independent. (Hints: first define the random variable X. Then write the objective of each question in terms of X.)
a) If you randomly select 15 patients from those visiting the emergency department, what is the chance that all of them need to be in the emergency room? @amistre64

Question

About 55% of emergency room visits are unnecessary. Assuming each emergency room visit is independent. (Hints: first define the random variable X. Then write the objective of each question in terms of X.)
a)	If you randomly select 15 patients from those visiting the emergency department, what is the chance that all of them need to be in the emergency room? @amistre64

anonymous · Answer

@amistre64  please when u come online,please help me out on this one..if u can write out the how im supposed to work it out.. thanks

amistre64 · Answer

15 choose 15 = 1 way to draw this lot

.55 = NOT need
.45 = need

so id gander to say .45^(15) is a good bet