Stats & Probability Exam Review

What is the probability that you choose blue? *simplify your answer*

5 green

6 yellow

8 blue

7 brown

• 8/26

• 4/13

• 8/25

• 1/3

Tags

CCSS.7.SP.C.7B

A die is rolled. What is the probability that the result is less than 3 ?

• 1/2
• 1/3
• 1/4
• 1/6

Tags

CCSS.7.SP.C.7A

The letters that form the word ALGEBRA are placed in a bowl. What is the probability of choosing a letter other than “A”? 

• 2/7
• 5/49
• 5/7
• 10/49

Tags

CCSS.7.SP.C.7B

What is the probability of rolling a dice and landing on a 4, and then rolling the dice again and landing on any even number?

• 1 ⁄ 6
• 1 ⁄ 8
• 1 ⁄ 2
• 1 ⁄ 12

A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6
• 1/2
• 1/3
• 1/6

If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? 

• -5
• -2
• 2
• 5

Tags

CCSS.HSS.ID.A.4

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  What is the z-score for a temperature of 17 degrees?  

• 1 
• 1.43
• -1.43
• 11.5

Tags

CCSS.HSS.ID.A.4

At a recent invitational, Emmett ran the 400 in 53.5 seconds with an invite mean of 51 and a SD of 3. Reese ran the 800 in 2 minutes, 1 second with the mean being 2 minutes 46 seconds and SD of 15 seconds.

What were their Z-scores and who performed better?

• Emmett's Z-score was +0.83, Reese's was -3.0. Emmet did better

• Emmett's Z-score was +0.83, Reese's was -3.0. Reese did better because in track lower z-scores are better.

• You can't tell since it's two different events.

• Mr. McDonald can smoke both of 'em.

Tags

CCSS.HSS.ID.A.4

Determine the type of sampling used in the following scenario: Divide students into freshmen/sophomores and juniors/seniors and then conduct a survey about the amount of time spent studying.

• Systematic

• Simple Random

• Cluster

• Stratified

Tags

CCSS.HSS.IC.B.3

Determine the type of sampling used in the following scenario: Divide the users of the Internet into different age groups and then select a random sample from each age group to survey about the amount of time they spend on the Internet each month.

• Systematic
• Simple Random
• Cluster
• Stratafied

Tags

CCSS.HSS.IC.B.3