HW# 10: Binomial

Determine P(Y=30).

0

What are the possible values of Y?

integers from 0 to 25

What is the mean of Y?

10

What is the standard deviation of Y?

2.45

For the random variable X, how many trials are being performed? n =

25

For the random variable X, what is a "success"?

a negative value

For the random variable X, what is a "trial"?

a single draw

Use the binomial excel spreadsheet to determine P(Y=11).

0.1465

Also use the binomial excel spreadsheet to help you find P(Y<9). Note: this asks for < where the spreadsheet gives ≤

0.2735

For the random variable X, what is the success probability p?

0.36