Probability and Statistics

Find the Mean. 

• 5.8

• 5

• 5.6

• 6

Manny wants to know how many students at CTMS enjoy solving math problems. What is the best sampling method?

• ask for 20 volunteers to discuss whether they enjoy solving math problems

• ask the last 20 people to arrive at CTMS 

• Randomly ask 2 students in the hallway

• Ask every 20th student that walks into school

If a set of data has a symmetric distribution, the most appropriate measure of center and variation to use is...

• median & interquartile range

• mean & interquartile range

• median & mean absolute deviation

• mean & mean absolute deviation

What is the difference in the IQRs?

• 1

• 2

• 3

• 4

If the probability of an event is 1, then it is _________.

• likely

• unlikely

• certain

• impossible

This board game spinner is divided into sections of equal size. What is a reasonable estimate of the number of times the spinner will land on a section labeled 5 over the course of 150 spins?

• 2

• 20

• 30

• 50

Suppose you have a bag that contains 4 black, 3 green, 1 red, and 2 orange marbles. Find P (not orange). Express your answer as an exact decimal.

(a)  

Suppose you have a bag that contains 4 black, 3 green, 1 red, and 2 orange marbles. Find P (green or red). Express your answer as an exact decimal.

(a)  

Which of the following describes two dependent events?

• A fair die is rolled and a coin is tossed.

• A card is chosen from a deck, replaced, and another card is chosen.

• A marble is picked from a bag, not replaced, and then another marble is chosen.

• Two fair dice are rolled.

You roll a fair number cube. Classify the event as either unlikely, likely, or neither unlikely nor likely: "Rolling a 3"

• unlikely

• likely

• neither unlikely nor likely