"Can I Definitely Touch the Red Ball?" Possibility PPT Courseware 2

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"Can I Definitely Touch the Red Ball?" Possibility PPT Courseware 2

1. Which of the following events is inevitable ( )

(A) The bottle will explode (B) The car will malfunction over a period of time

(C) The earth is rotating (D) The next World Cup will be held in China

2. Which of the following events is an uncertain event ( )

(A) The oil underground will run out

(B) Two students in a class have the same birthday

(C) When two numbers with different signs are multiplied together, the product is a negative number.

(D) The sun rises from the west

3. October 1 this year is National Day. This event is ( )

(A) Necessary event (B) Impossible event

(C) Uncertain event (D) Unable to determine

In the ball touching activity above, the color of the ball touched each time is uncertain. If the number of red balls and yellow balls is not equal, then the possibility of getting a red ball is different from the possibility of getting a yellow ball.

Generally speaking, the probability of an uncertain event occurring varies.

1. Xiao Ming buys a movie ticket at will. Which is more likely that the seat number is a multiple of 2 or that the seat number is a multiple of 5?

2. Please find a random classmate in the class. Which is more likely to find a male classmate or a female classmate? Why?

3. There are three buses of No. 1, No. 12 and No. 31 stopping at a certain bus station. It is known that No. 1 bus comes once every 8 minutes; No. 12 bus comes once every 5 minutes; No. 31 bus comes once every 10 minutes. Then at a certain bus station At that time, when Xiao Ming goes to the bus station, he is most likely to wait for bus number _ first.

4. The picture below is a partial schematic diagram of the floor of Xiao Ming’s house. It is made up of black and white squares of the same size. The kitten in the house is walking on the floor. I would like to ask:

(1) The kitten stepped on the white square floor. What type of event does this belong to?

(2) The kitten stepped on the white or black square floor. Which type of event does this belong to?

(3) The kitten stepped on the red square floor. What type of event does this belong to?

(4) Which color square floor is more likely for a kitten to step on?

think about it

1. There are 8 white balls, 4 yellow balls and 2 red balls in the box, all the same except for the color. If you pick up a ball at random, what are the possible outcomes? Which one is most likely? Which is the least likely?

summary:

What did we learn today? What learning and research methods have you learned?

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"Can you definitely get the red ball?" Possibility PPT courseware:

"Will you definitely be able to touch the red ball?" Possibility PPT courseware Random ball touching test box contains 20 balls. Conduct the ball experiment in three situations and make statistics: (1) All 20 balls are red balls; (2) ) 10 red balls and 10 yellow balls; (3) 20 all yellow balls..

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Update Time: 2024-11-20

This template belongs to Mathematics courseware Beijing Normal University Edition Seventh Grade Mathematics Volume 1 industry PPT template

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