Find the mean St Dev for each Mean

Find the mean & St. Dev for each. Mean St. Dev X 8 3 Y 12 4

Find the mean & standard deviation x p(x) 4 0. 2 7 0. 31 12 0. 24 15 0. 18 18 0. 07

BINOMIAL DISTRIBUTION FORMULA Section 6. 3 A

Binomial Experiment - BINS • Binary? • There are two possible outcomes – success and failure • Independent? • Trials must be independent • Number? • The number of trials must be fixed – out of n…. • Success? • On each trial the probability of success must be the same

Let E be the event that a person goes out shopping on Black Friday. Find the probability distribution for a sample of 3 people if the P(E) =. 78.

Probability distribution of going shopping on black Friday for 4 people. P(E) =. 78

Let’s Develop the formula! •

Binomial Distribution where

The survival rate for a risky operation is 80%. What is the probability that exactly 4 of the next 5 patients survive?

USA today stated that 45% of Americans know somebody who became addicted to a drug other than alcohol. If we randomly ask 15 people, what’s the probability that exactly 3 were addicted?

What’s the probability that at least 12 are addicted?

What the probability that less than 3 are addicted?

90% of the trees planted by a landscaper will survive. If 10 trees are planted, what’s the probability more than eight survive?

The probability that a person will subscribe to Statistics Monthly is 48%. Find the probability that out of a group of seven, at least one person subscribes.

There are charts as well – but only for some probabilities so you need to know the formula.

Homework • Worksheet