"Using tree diagrams or tables to find probabilities" Further understanding of probability PPT courseware 2

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"Using tree diagrams or tables to find probabilities" Further understanding of probability PPT courseware 2

do you remember?

In life, there are some things that we can first be sure will happen. These things are called inevitable events.

There are some things that we can first be sure will not happen. These things are called impossible events.

There are some things that we cannot be sure will happen in advance. These things are called uncertain events.

Probability is a mathematical discipline that studies the statistical laws of a large number of similar random phenomena.

Probability is a quantitative measure of the likelihood of a random event occurring.

In independent random events, if the frequency of an event in all events is relatively stable around a fixed constant in a larger range, the probability of the event can be considered to be this constant.

Calculation of probability:

Generally speaking, if all possible outcomes in an experiment are equally likely, then the probability of event A occurring is

A common method for finding the occurrence of an event is to list all possible outcomes, and then calculate the total number of all possible outcomes and the number of possible outcomes of A in the event, thereby finding the probability of the event being sought.

When finding probability, we can use "dendrogram" or "list method" to help analysis.

Use tables to study the above questions

As can be seen from the tree diagram or table above:

(1) In the card drawing game, there are four possible outcomes in a trial: (1,1), (1,2), (2,1), (2,2),

(2) Each outcome is equally likely to occur. In other words, the probability of each outcome is 1/4.

(3) The probabilities that the sum of the numbers on the two cards are 2, 3, and 4 are 1/4, 1/2, and 1/4 respectively.

There are four red balls and two blue balls in the bag.

They are identical except for color;

(1) The probability that a ball is picked out at random and is a red ball is ______;

(2) Pick out a ball at random, record the color and put it back into the bag. Mix it thoroughly and then randomly pick out a ball. The probability of getting a red ball twice is ______;

(3) Two balls are randomly picked out at once. The probability that both balls are red balls is ______.

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"Using Tree Diagrams or Tables to Calculate Probability" Further Understanding of Probability PPT Courseware 4 Probability can use tree diagrams or tables to clearly express all possible outcomes of an event; thus it is easier to calculate the occurrence of certain events Probability. With purple game small..

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"Using Tree Diagrams or Tables to Find Probabilities" Further Understanding of Probability PPT Courseware 3 Game Rules: Prepare two groups of identical cards. The numbers on the two cards in each group are 1 and draw one from each group of cards. It is a trial. In the card drawing game, in the first trial, if you draw...

"Using Tree Diagrams or Tables to Find Probabilities" PPT courseware for further understanding of probability:

"Using Tree Diagrams or Tables to Find Probabilities" Further understanding of probability PPT courseware The relationship between frequency and probability When there are many trials, the frequency of an event is stable around the corresponding probability. Therefore, we can use the frequency of an event through multiple trials Let's estimate...

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Update Time: 2024-09-29

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