Probability with Percent Distribution

Use the following box and whisker plot to identify what percent of scores are below 82?

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

• No, some of probabilities are not between 0 and 1 inclusive

• No, the sum of all the probabilities is not 1.

• Yes, because the distribution is symmetric

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the mean and the standard deviation.

• μ = .4; σ = 7.5

• μ = 2.5; σ = 1.1

• μ = 3; σ = 1.3

• μ = .1; σ = 0

Using the probability distribution, find P(X > 1).

Given the probability distribution, what is P(X < 1)?

Find the probability the snowfall will be between 3 and 6 inches.

• .2

• .4

• .6

• 1

What is the probability distribution of getting a sum of 2?

• 0.0625

• 0.6250

• 0.125

• 0.375

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. Approximately what percent of days in February will be between 14.6 and 31.4 degrees?

• 68%

• 50%

• 99.7%

• 95%

Find the area under the standard normal curve where z < 2.42 .

• .008

• .992

• .301

• .862

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that the tenth blood donor is the first donor with Type B blood?

• approximately 0.00

• 0.316

• 0.0385 

• 0.279