Unit 10 Probability Review

Unit 10 Probability Review

Multiple Choice

A bag has 3 Red, 5 Blue and 2 Yellow pieces of candy. What is the probability of reaching in the bag and pulling out a BLUE candy?

• 1/2

• 3/10

• 1/10

• 1/3

Heres Why:

• You need to know the total amount there: 10 pieces of candy.

• You need to know how many BLUE candies there are. (THATS 5)

• Put it into a fraction and it becomes 5/10.

• Remember you must simplify the fraction and therefore it turns to 1/2.

Multiple Choice

A spinner consists of two A's, three B's, and Three C's. What is the probability of spinning a B?

• 2/8

• 3/8

• 2/3

• 14

Heres Why:

• You need to know the total amount of spaces available to land on: 8 spaces total.

• You need to know how many B's you could land on: 3.

• Put it into a fraction and it becomes 3/8

• This fraction CANNOT be simplified as it is already in simplest form.

Multiple Choice

The faces of a fair 6-sided number cube are numbered 1-6. The number cube is rolled. What is the probability it will land on a 2?

• 5/6

• 1/6

• 1/2

• 1/3

Heres Why:

• You need to know the total sides on a dice: 6 total.

• You need to know how many sides have the number 2: 1 side has a 2 on it.

• Put it into a fraction and it becomes 1/6

• This fraction CANNOT be simplified as it is already in simplest form.

Multiple Choice

Which of the following statements is true about the relationship between experimental and theoretical probabilty?

• No relation.

• As the number of trials increases, experimental probability gets closer to theoretical probability.

• As the number of trials increases, experimental probability gets further away from theoretical probability.

• They are the same thing.

Here's Why

• THE MORE TIMES I CONDUCT A TRIAL IN AN EXPERIMENT THE CLOSER I GET TO REACHING WHAT I THINK SHOULD HAPPEN.

• EXAMPLE: FLIPPING THE COIN. YOU PROBABLY DIDN'T FLIP IT AND GET 5 HEADS AND 5 TAILS BUT AS CLASS, WE WERE VERY CLOSE TO THE 50/50 PROBABILITY THAT EXISTED.

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Multiple Choice

BETH WILL REACH INTO THE BAG AND RANDOMLY CHOOSE 1 BALLON. WHAT IS THE PROBABILITY THAT SHE WILL CHOOSE A GREEN BALLOON?

• 3/5

• 2/5

• 1/3

• 2/3

Heres Why:

• You need to know the total balloons in the bag: 55

• You need to know how many green balloons there are: 22

• Put it into a fraction and it becomes 22/55

• This fraction can be simplified to 2/5.

Multiple Choice

The arrow of this spinner was spun 24 times and landed on the letter B four times. WHAT IS THE EXPERIMENTAL PROBABILITY THAT THE ARROW WILL LAND ON THE LETTER B?

• 1/2

• 1/24

• 1/6

• 1/8

Heres Why:

• You need to know the total AMOUNT OF TIMES THE SPINNER WAS SPUN: 24

• You need to know how many times they landed on B: 4

• Put it into a fraction and it becomes 4/24

• This fraction can be simplified to 1/6

Multiple Choice

A standard coin has two sides, heads and tails. A coin is tossed 75 times. If the coin lands on heads 35 times, what is the EXPERIMENTAL PROBABILITY.

• 9/15

• 1/15

• 7/15

• 3/5

Heres Why:

• You need to know the total AMOUNT OF TIMES THE COIN WAS FLIPPED: 75

• You need to know how many times they landed on HEADS: 35

• Put it into a fraction and it becomes 35/75

• This fraction can be simplified to 7/15

Multiple Choice

A regular card deck contains 52 cards, 4 of which are aces. Assuming the cards are dealt randomly, what is the probability that the first card dealt will be an ace?

• 1/13

• 1/52

• 4/13

• 1/12

Heres Why:

• You need to know the total AMOUNT OF CARDS IN THE DECK: 52

• You need to know how many ACES THERE ARE: 4

• Put it into a fraction and it becomes 4/52

• This fraction can be simplified to 1/13

Multiple Choice

Benny has a basket of 5 red balls, 3 yellow balls and 2 green balls. WHAT IS THE PROBABILITY THAT THE NEXT BALL HE CHOOSES WILL BE RED OR GREEN.

• 1/5

• 7/10

• 1/2

• 3/10

Heres Why:

• You need to know the total AMOUNT OF BALLS IN THE BASKET: 10

• You need to know how many OF THOSE BALLS ARE RED OR GREEN: 7

• Put it into a fraction and it becomes 7/10

• This fraction cannot be simplified any more.

Multiple Choice

A coin is tossed 500 times. Using the mind of theoretical probability, how many times SHOULD the coin land on heads?

• 125

• 250

• 500

• 300

Heres Why:

• You need to know the total AMOUNT OF TIMES THE COIN IS GOING TO BE FLIPPED: 500

• You need to know THE PROBABILITY OF THE COIN LANDING ON HEADS: 1/2

• 1/2 * 500= 250

• IF THE COIN IS FLIPPED 500 TIMES THEN THEN 1/2 OF THEM (250) SHOULD BE HEADS.

Multiple Choice

The faces of a 6-sided number cube are labeled 1 through 6. If you roll a PAIR NUMBER CUBES, what is the theoretical probability that BOTH will land on the number 6.

• 1/6

• 1/36

• 1/12

• 1/3

Here's WHY:

THE END!!!