"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware 3

"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware 3

do you remember

The bag contains two balls, which are identical except for their color. Take a ball at random from the bag.

1. If both balls in the bag are red, if one is a red ball, it is called a ______ event; if one is a white ball, it is called a ______ event; (choose "inevitable", "uncertain" and " impossible")

2. If there is a red ball and a white ball in the box, and one is a red ball, it is called a ______ event.

learning target:

1. Through the ball-touching game, the probability of uncertain events will be calculated;

2. Be able to design simple games that fit the theme

believe you can do it

1) If there are 3 red balls and 1 white ball in the bag, do the students think that if this student touches a ball, what color might the ball drawn out be? Communicate with peers.

2) If each ball is numbered, namely ball No. 1 (red), ball No. 2 (red), ball No. 3 (red), and ball No. 4 (white), then the student touches each ball. Are the balls equally likely?

3) If you pick up a ball at random, can you tell all the possible outcomes?

All possible results are: Ball No. 1, Ball 2, Ball No. 3, Ball No. 4. The possible results of touching the red ball are: Ball No. 1, Ball 2, Ball No. 3.

Three cobblers stand up to one Zhuge Liang

1) Can you write down the probability of getting a white ball?

Solution: P (touch the white ball) = 1/4

2) If the ball-touching game is replaced by two red balls, what are the probabilities of touching the red ball and the white ball?

Solution: P (touched the red ball) = 1, P (touched the white ball) = 0

3) Can you write down the probabilities of inevitable and impossible events?

Solution: P (necessary event) = 1, P (impossible event) = 0

4) Can you guess the range of probability of uncertain events?

Solution: 0�P (uncertain event)�1

give it a try

Example 1. Throw a small uniform cube (each face of the cube is marked with 1 point, 2 points, 3 points, 4 points, 5 points, 6 points). What is the probability that "6 points" will land upward?

Solution: If you throw a small uniform cube at will, there are 6 possible outcomes: "1 o'clock" heads up, "2 o'clock" heads up, "3 o'clock" heads up, "4 o'clock" heads up, "5 o'clock" The "point" points upward, and the "6 point" points upward, and the probability of each outcome is equal. Among them, there is only one result of "6 o'clock" pointing up, so P ("6 o'clock" pointing up) = 1/6

Practice in class

1. If one person from our class is randomly selected to play a game, what is the probability that you will be selected?

2. From a deck of playing cards (excluding the big and small kings), if one card is randomly selected, what is the probability of drawing a diamond? What is the probability of drawing a spade?

Solution: P (draw a diamond) = 13/52 = 1/4

P (draw a spade)=13/52=1/4

Just give it a try

Design a ball-touching game using 4 balls that are identical except for color.

1) Make the probability of getting a white ball 1/2 and the probability of getting a red ball 1/2;

2) The probability of getting a white ball is 1/2, and the probability of getting a red ball is 1/4;

Can you design a game that satisfies the above conditions using 8 balls that are identical except for color?

Talk about it

List the “probability phenomena” you see in your daily life.

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"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware 2:

"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware 2 Reviewing the Past and Learning the New There are two balls in the bag, which are exactly the same except for their color. Take a ball at random from the bag. 1. If there are two red balls in the bag and one is a red ball, then it means _____ that the red ball is drawn out..

"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware:

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