Probability Big Ideas

You randomly choose a letter from a hat that contains the letters A through K. What are the possible outcomes?

• A,B,C,F,L,M,N,Z,K,Y,W

• A,B,C,D,E,F,G,H,I,J,K

• K,K,K,M,N,G

• A,Z,B,Y,C,X,D,W,E,K

You have 10 coins in your pocket. Five are Susan B. Anthony dollars, two are Kennedy half-dollars, and three are presidential dollars. You randomly choose a coin. In how many ways can choosing not a presidential dollar occur

• 8

• 3

• 7

• 2

The probability that you randomly draw a short straw from a group of 40 straws is 3/20 . How many are short straws

• 4

• 6

• 15

• 34

Tags

CCSS.7.RP.A.3

Probability that is based on repeated trials of an experiment is called... what?

• express probability

• repeated probability

• experimental probalilty

• experimental probability

The number of students in the marching band increased from 100 to 125. What is the percent of increase? Round your answer.

• 23.7%

• 80.9%

• 25.0%

• 25.1%

Tags

CCSS.6.RP.A.3C

Tell whether the events are independent or dependent. Explain.

You roll a 4 on a number cube. Then you roll an even number on a different number cube.

• independent; The outcome of the first roll affects the outcome of the second roll.

• dependent; The outcome of the first roll does not affect the outcome of the second roll.

• independent; The outcome of the first roll does not affect the outcome of the second roll.

• dependent; The outcome of the first roll affects the outcome of the second roll.

Which set of numbers is in order from least to greatest?

• 0.269,27%, 3,11

• 44.5%

  44.5%, 4,9

  49, 0.46

• 21,7,217, 214%

• 1,9,09.15,0.915%

What is the sample space of an event? How can you find the sample space of two or more events?

• A sample space is a number that measures the likelihood that an event will occur. Use a table or tree diagram to list all the possible outcomes.

• A sample space is the set of all possible outcomes of an event. Use a bar graph or a probability fraction to list all the possible outcomes.

• A sample space is the set of all possible outcomes of an event. Use a table or tree diagram to list all the possible outcomes.

• A sample space is the set off all possible outcomes of an event. Use a table or tree diagram to list all the outcomes.

Give a real-life example of a compound event.

• choosing two marbles from a bag

• finding a certain salad dressing in an aisle at the grocery store

• determining the number of cakes that are chocolate

• taking a quarter from a pile of change

You flip a coin 10 times and find the experimental probability of flipping tails to be 0.7. Does this seem reasonable? Explain.

• yes; 0.7 rounds to 1, and probabilities should be equal to or greater than 1.

• yes; In an experiment, you could flip tails 7 out of 10 times, but with more trials the probability of flipping tails should get closer to 0.5.

• no; The probability of flipping tails should be 0.5. It is equally likely to flip heads or tails.

• no; The probability should be greater than 1.