Probability

Theoretical & Experimental Probability

100

The theoretical probability of rolling an odd number on a standard number cube.

What is 1/2 ?

200

The probability of tossing at least 1 tail if you toss three coins at once?

What is 7/8 ?

300

A bag has 42 red marbles, 15 blue marbles, 3 orange, and 8 green marbles.  If a marble is chose at random, what is the probability that the marble is not orange?

What is 65/68 ?

400

A spinner has 4 equal sections. After 12 spins, the spinner landed on  section A 4 times, section B 5 times, section C 2 times, and section D  1 time.  

What is the experimental probability of the spinner stopping on section A?  

What is 1/3 ?

500

If the probability of an event occurring is 1/4 , what is the  probability of its complement?  

What is 3/4 ?

Frequency Tables

100

Fresman - 2, Sophomores - 3, Juniors - 5 &Seniors - 4

What is the P(senior)?

What is 2/7?

200

Find the relative frequency that a student was not involved in a water sport.

Table 1 - WS Practice  13.2 - form G- 

What is 25/43 ?

300

Favorite Fruit

Fruit            Number of repsonses

apple                    12

pear                     25

banana                 11

What is the relative frequency of choosing a pear?

What is 25/48 ?

400

One possible result of a situation or experiment

is a(n)......

What is outcome?

500

The relative frequencies of two of three possible outcomes are 1/2 and 1/3.  What is the relative frequency of the third outcome?

What is 1/6 ?

Compound Probability

100

You eat a piece of fruit from a basket of apples, bananas, pears and melons.  Later your brother eats a piece of fruit from the basket.  Do these represent independent or dependent events?

What is dependent events?

200

What is P(A and B) if A and B are independent events, P(A)=0.24 and P(B)=0.15?

What is 0.036 ?

300

At a grocery store, there is a 62% chance that a customer will pay with a credit card and a 25% chance that a customer will pay with cash.  What is the probability that a randomly selected customer will pay with a credit card or cash?

What is 87 % ?

400

Angelo chooses a number from 1 to 10.  What is the probability that he chooses an odd number or a multiple of 5?  

What is 3/5  or 0.6  or 60% ?

500

A spinner has 8 equal sections numbered 1 to 8.  What is the probability of the spinner stopping on a number that is a multiple of 3 or is greater than 5?

What is 1/2 or 0.5 or 50% ?

Probability Models

100

What is the probability that a randomly chosen patient caught a cold and did not exercise?

WS 13-5 - G #1

What is 1/5 or 0.2 or 20% ?

200

What is the probability that a randomly chosen patient exercised and did not catch a cold? 

WS 13-5 - G #1

What is 3/5 or 0.6 or 60% ?

300

What is P(did not exercise | did not catch a cold)?

WS 13-5 - G #1

What is 1/16 or 0.0625 or 6.25% ?

400

What is P(has red berries | has lobed leaves)?

WS 13-5 G #11

What is 3/13 or 0.231 or 23.1% ?

500

What is P(has lobed leaves | has red berries)? 

WS 13-5 G #11

What is 1/5 or 0.2 or 20% ?

Conditional Probability

100

What is P(4-wheel drive | pickup truck)?

TE page 861A #1

What is 0.6875 or 68.75% ?

200

In a survey of computer owners, 80% use an anti-virus program, 25% use and anti-spyware program, and 15% use both.                                                  What is P(anti-virus|anti-spyware)?  

What is 3/5 or 60% ?

300

Half of the class took Form A of a test and half of the class took Form B.  Of the students who took Form B, 39% passed.  What is the conditional probability that a randomly chosen student took Form B and passed?

What is 0.195 or 19.5% ?

400

The diagram shows the percentages of plants that received sunlight and whether or not they grew.  What is the probability that the plant grew?

WS 13.6 form G - # 6

What is 0.3775 or 37.75% ?

500

In the senior class, 24% of the students play softball, 32% play hockey and 14% play both.  What is the probability that a hockey player also plays softball? 

What is 0.4375 or 43.75% ?