"Probability" Probability preliminary PPT courseware

Description

"Probability" Probability preliminary PPT courseware

learning target

1. Understand the meaning of probability in specific contexts.

2. Able to find the probability of an event in simple problems.

[Thinking] Analyze whether these events occurred or not, what are the characteristics of each?

(1) "The earth keeps turning"

(2) "Wood burns and produces energy"

(3) "At normal temperatures, stones are weathered in one day."

(4) "Someone shoots once and hits ten rings"

(5) "Flip a coin and it comes up heads"

(6) "Snow melts at standard atmospheric pressure and when the temperature is below 0°C"

Ball touch test: There are 4 black balls and 2 white balls in the bag. The shape, size, texture, etc. of these balls are exactly the same. Under the condition that the ball cannot be seen, a ball is randomly picked out from the bag.

(1) Is this ball a white ball or a black ball?

(2) If both kinds of balls are likely to be drawn, is the probability of drawing a black ball as high as that of a white ball?

Induction: Generally speaking, the probability of a random event occurring varies, and the probability of different random events occurring may be different.

Thinking: Can the probability of "finding a black ball" and "finding a white ball" be the same by changing the number of balls of a certain color in the bag?

think:

(1) A bag contains 20 balls of the same shape, texture, and size. Among them, 4 are white balls, 2 are red balls, 3 are black balls, and the others are yellow balls. Touch any one of them and choose which ball you touch. most likely?

(2) A person randomly flips through the book three times and turns to an even-numbered page three times. Can we say that it is more likely to turn to an even-numbered page?

(3) The bag contains red and white balls with the same texture, size and shape. Xiao Ming randomly picks out a ball and puts it back. If Xiao Ming touches the red ball 5 times, can he determine whether the ball is in the bag? Are there more red balls than white balls? How can you tell which color has more balls?

(4) It is known that the ratio of land area to ocean area on the earth's surface is 3:7. If a meteorite flies from the universe and falls on the earth, which one is more likely to "fall in the ocean" or "fall on land" ?

Through the study of this class, we need to:

1. Understand the meaning of probability in specific contexts.

2. Able to find the probability of an event in simple problems.

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Update Time: 2024-09-19

This template belongs to Mathematics courseware People's Education Press Ninth Grade Mathematics Volume 1 industry PPT template

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