Probability Review

Quiz is scheduled for Thursday, May 2nd, 2019

Probability Review

1. Use the words impossible, likely, unlikely or certain to describe the following events:

a) If you flip a coin once, you will get a head and a tail: ____________________

b) If you roll a die once, you will get a number less than six:____________________

c) Eight metres of snow will fall today: ____________________

2. Dakota and Bryan count their coloured paper clips and record the results in the table below.

Colour	Dakota	Bryan
Red	14	18
Yellow	7	9
Blue	6	5
White	17	20

They put all of the paper clips in a box. Dakota chooses one paper clip from the box without looking.

Determine the probability that Dakota chooses a red paperclip.

Show your work.

3. A spinner has 12 equal sized sections. The sections are labelled 1 through 12. What is the probability that Eva will spin a multiple of 3 on her first spin?

Explain how you know.

5. Put these fractions into a percent. You may use a calculator.

1. 5/20    b) 9/10 c)  8/35 d) 6/50

6. Rori has a bag of 20 coloured blocks. Without looking, she reaches in and pulls one block out. Complete the table below to determine the probability of choosing a red, green, purple or yellow block.

Colour	Fraction	Decimal	Percent	Ratio
Red	6/10
Green		0.5
Purple				2:10
Yellow			0.7

7. Keenan places 3 green marbles, 4 yellow marbles and 1 blue marble in a bag. Keenan then adds 1 green marble and 1 yellow marble to the bag. Does the probability that Keenan will randomly choose a yellow marble increase, decrease or stay the same?

Justify your answer.

TREE DIAGRAM (We will do this next week)

8. Falynn goes to a fast food restaurant after cheering on the home team at a football game. Falynn wants to order a drink, fries and a burger. Here are her choices:

Drink	Fries	Burger
Lemonade	Small	Cheesy Burger
Water	Medium	The Bacon King
Dr. Pepper	Large

How many different combinations can Falynn choose from?