Binomial Probability Review

When rolling two dice, the probability of rolling doubles is ⅙. Suppose that a game player rolls the dice four times, hoping to roll doubles. Find the probability that the player gets doubles twice in 4 attempts.

• 88.4%

• 11.6%

• 98.4%

• 1.6%

When rolling a fair die 100 times, what is the probability of rolling a "4"exactly 25 times?

• 0%

• 16.7%

• 25%

• 2.1%

If you were to flip a coin 20 times, what is the probability you would get at least 13 heads?

• 94.23%

• 13.16%

• 5.77%

• 7.39%

A quarterback has a passing percentage of 70%.  What is the probability that he does not complete 8 of his 20 passes?

• 11.44%

• 12.45%

• 54%

• 12.34%

A coin is tossed ten times.  What is the probability that there are exactly 6 heads?

• 20.51%

• 90%

• 45.68%

• 34.65%

The table represents the probability of guessing correct on a 5 question true-false quiz.  Find the probability for at least 4 questions correct.

• .03125

• .15625

• .3125

• .1875

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the expected number a student will get when they guess.

• 0.4

• 2.5

• 3

• 0.1

• Not possible with the given information.

When rolling a die 25 times, what is the probability of rolling a 5 at least 4 times?

• 0.382

• 0.228

• 0.618

• 0 (impossible)

The table above shows the number of cell phones per household in a small town. Find the expected value of a typical household, rounded to the nearest hundredth.

• 2.80

• 2.93

• 0.10

• 0.14

What does the r stand for in the binomial probability formula?

• Number of trials

• Number of EXACT trails we are choosing from the total

• Probability of Successes

• Probability of Failures