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Published byAmelia Harrison Modified over 9 years ago

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14 – 7c Probability The probability of a chance event is a number between 0 and 1 that expresses the likelihood of the event occurring. Usually expressed as fractions.

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**What is the probability of the spinner landing on green?**

Probability of red pens What is the probability of the spinner landing on green?

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**The possible outcomes for rolling a pair of fair dice are shown below**

The possible outcomes for rolling a pair of fair dice are shown below. What is the probability of rolling a sum of nine?

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There are 19 pairs of red gloves, 13 pairs of black gloves, and 28 pairs of blue gloves in the sale bin at a discount store. If a sales clerk at the store randomly passes out pairs of gloves to 15 customers, which of the following is the best prediction of the number of customers who will receive blue gloves? First, find the probability of a customer receiving a pair of blue gloves. Next, multiply the number of customers by the probability to predict the number of customers who will receive a pair of blue gloves.

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**The possible outcomes for rolling a pair of fair dice are shown below**

The possible outcomes for rolling a pair of fair dice are shown below. What is the probability of rolling a sum that is a multiple of four?

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**Kendall's birthday is on April 15th**

Kendall's birthday is on April 15th. His friends, Gustavo, Matt, Stephen, and Daran, were born in the same year as Kendall. None of Kendall's friends share a birthday with each other. What is the probability that Kendall does not share a birthday with any of his friends? (Assume the boys were not born in a leap year.)

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A ticket brokering company is randomly distributing tickets to customers who pre-ordered tickets for an upcoming concert. Out of the first batch of tickets sent to pre-order customers, 25 are in row 7, 19 are in row 8, and 11 are in row 9. Which of the following is the best prediction of the number of tickets in row 7 in the next 33 tickets sent out? 15 25 out of 55 tickets are in row 7 Next, multiply the number of tickets sent out next by the probability to predict the number of customers who will receive a ticket in row 7

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**Everett is rolling a block with the numbers 1, 2, 3, 4, 5, and 6 on it**

Everett is rolling a block with the numbers 1, 2, 3, 4, 5, and 6 on it. Finley is drawing one disk from a basket of three disks: one blue, one red, and one yellow. What is the probability that Everett and Finley end up with an even number and a blue disk?

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Sam is rolling a number cube with the numbers 1, 1, 2, 2, 3, and 3 printed on it. What is the probability that, if he rolls the cube twice, the sum of the numbers will add to 4?

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Notice that all four sections on the spinner are equal, so it has a probability of landing on Section D 1 time out of every 4 spins. In order to predict the number of times the spinner would land on Section D if it was spun 160 times, set up a proportion and solve.

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A standard deck of 52 cards has four 13-card suits: diamonds, hearts, clubs, and spades. The diamonds and hearts are red, and the clubs and spades are black. Each 13-card suit contains cards numbered from 2 to 10, a jack, a queen, a king, and an ace. The jack, queen, and king are called face cards.

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**Roger drew one card from a standard deck of 52 cards**

Roger drew one card from a standard deck of 52 cards. What is the probability that the card Roger drew is not red?

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**The possible outcomes for rolling one six-sided die are shown below**

The possible outcomes for rolling one six-sided die are shown below. Molly rolled a six-sided die 20 times. The numbers she rolled are shown below. What is the probability that Molly will roll a five on her next roll? Theoretical Experimental The die has six sides, each numbered one through six. No matter what numbers Molly has already rolled, the probability of rolling any of the six numbers on her next roll is still 1/6 .

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**Jasper works as an inspector at a factory that makes polo shirts**

Jasper works as an inspector at a factory that makes polo shirts. He has found that the probability of a shirt that is produced being defective is 1/50 . If 1,750 polo shirts are produced in one day at the factory, which of the following is the best prediction of the number of defective polo shirts?

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The probability of randomly selecting a green marble from a bag of 20 marbles is . Which of the following describes the likelihood of selecting a green marble? Since the probability is closer to 0 than it is to 1/2 , the likelihood of selecting a green marble is unlikely.

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A game requires each player to spin a spinner with four equal sections and roll a die numbered 1 through 6. The sections on the spinner are colored red, blue, green, or yellow. The table below shows all the outcomes of one spin and one roll. What is the probability of landing on green or yellow and rolling an even number?

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**Julio is trying to guess Amanda's birthday. He knows it is in January**

Julio is trying to guess Amanda's birthday. He knows it is in January. What is the probability that her birthday is not the 30th? Since the chance that Amanda's birthday is the 30th is 1 out of 31, the following is true

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Noel is playing a game where he draws one playing card each out of two stacks of 5 cards. The table below shows all possible sums for the two numbers on the cards. Is Noel more likely to draw two cards with a sum that is a multiple of 3 or two cards with a sum that is greater than 13? l

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Is Noel more likely to draw two cards with a sum that is a multiple of 3 or two cards with a sum that is greater than 13? l

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