Binomial Experiment

What is the probability of guessing 8 correct multiple choice answers out of 20 questions? Each question has 4 choices per question and only one correct answer.

• .10

• .06

• .80

• .07

If you flip a coin 50 times, what is the probability of getting exactly 25 heads?

• .50

• .08

• .11

• .22

Which is an example of a binomial experiment

• Rolling a die until a 6 appears

• Asking 20 people how old they are

• Tossing a coin 20 times to see how many tails appear

• Drawing 5 cards from a deck for a poker hand

When flipping a coin 100 times, what is the probability of getting tails exactly 45 times?

• .05

• .50

• .25

• .08

At a certain intersection, the light for westbound traffic is red for 16 seconds, yellow for 4 seconds, and green for 30 seconds. Find the probability that out of the next eight westbound cards that arrive randomly at the light, exactly three will be stopped by a red light.

• .58

• .67

• .1

• .27

What is the probability of getting exactly 5 heads when you flip a coin 10 times?

• .25

• .50

• .05

• .72

If you were rolling a die 50 times, what is the probability of getting a '2' on the die exactly 5 times?

• .09

• .07

• .1

• .5

If a fair coin if flipped 10 times, and T is the number of tails, T is a binomial random variable?

• Yes, T is a binomial random variable, and this is a binomial experiment.

• No, T is not a binomial random variable.

Is this a binomial experiment?

If Trina designates Y to be the number of yellow marbles, she gets during nine trials of randomly pulling 1 marble from a bag filled with marbles of various colors and returning it.

• Yes

• No

You survey 25 students to find out how many are left-handed.  The random variable represents the number of left-handed people.

• Binomial; n = 25, P(S) = student is right handed, P(F) = student is left handed

• Binomial; n = 25, P(S) = student is left handed, P(F) = student is right handed

• Not Binomial