"Estimating Probability Using Frequency" PPT

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"Estimating Probability Using Frequency" PPT

Part One: Knowledge Review

Questions (choose one of two questions):

1. Throw a die, the probability that the number on the upward side is 6 is _.

Wait for possible events

All outcomes are equally likely to occur

The results of the test are limited

2. When a shooter shoots once, the probability of hitting the bullseye is __________.

Hitting the bullseye and missing the bullseye are not equally likely

The results of the test are not finite

Frequency In the investigation, the number of times each object appears is called frequency.

Frequency The ratio of the number of times each object appears to the total number of times is called frequency.

Using frequency to estimate probability PPT, part 2: Estimating transplant survival rate

It is a probability in practical problems and can be understood as the probability of survival.

A forestry department wants to examine the transplant survival rate of a certain sapling under certain conditions. What specific methods should be adopted?

Observe the survival frequency of saplings obtained in each experiment and talk about your opinions.

It can be found from the table below that the frequency of transplantation survival of saplings swings around ____, and as the number of transplanted trees increases, this pattern becomes more and more obvious.

Therefore, it is estimated that the probability of survival of transplanted saplings is __________.

Using frequency to estimate probability PPT, part 3: common practice

For the sake of simplicity, can we directly regard the frequency of citrus damage corresponding to 500 kilograms of citrus in the table as the probability of citrus damage?

According to the frequency stability theorem, when the accuracy required is not very high, it may be appropriate to use the frequency in the last row of data in the table to approximately replace the probability.

give it a try

1. A certain athlete takes 5 shots and makes 4 of them. Can we say that the probability of the athlete making one shot is 4/5? Why?

No, because only when the number of repeated experiments increases significantly, the frequency of events will stabilize near the probability.

2. A sample of 1,000 shirts was inspected, and 2 of them were unqualified. Based on this, what is the estimated probability that 1 shirt will pass?

3. In 1998, a white calf was born on a farm in Hanno, Michigan, USA. According to statistics, on average only one of 10 million cows will be born white, so it is estimated that a cow is born white. What is the probability of ?

Using frequency to estimate probability PPT, part 4: sublimation improvement

Clarified a relationship------the relationship between frequency and probability

Frequency is not equal to probability. When there are many trials or the sample size is large enough, the frequency of an event will be very close to the corresponding probability. At this time, we can use the frequency of an event to estimate the probability of this event. Probability.

Understand a method-------use multiple trial frequencies to estimate probability

I experienced a thought:

Use samples to estimate the population

Use frequency to estimate probability

There are two ways to obtain probability: theoretical calculation and experimental estimation.

Keywords: Free download of Hebei Education Edition mathematics PPT courseware for the second volume of the ninth grade, using frequency to estimate probability PPT download, .PPT format;

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"Estimating Probability Using Frequency" PPT courseware download:

"Using Frequency to Estimate Probability" PPT courseware download Part 1: Learning objectives: Through experiments, statistics and other activities, be able to use experimental methods to estimate the probability of some complex random events. New Lesson Introduction The following events are certain events: ( ) A. Throw one...

"Estimating Probability Using Frequency" PPT download:

"Using Frequency to Estimate Probability" PPT Download Part One Content: Teaching Objectives 1. Through experiments and operations, understand the uncertainty of whether random events will occur in each experiment, and understand the relationship between the number of repeated experiments and the frequency of events. relation. 2. Ability to follow frequency...

"Estimating Probability Using Frequency" PPT courseware:

Contents of the first part of the PPT courseware "Using Frequency to Estimate Probability": Do it (1) Toss an even coin 400 times. Every 50 times, record the number of heads and tails. After summarizing the data, complete the following table : (2) Based on the data in the above table, draw a polyline in the graph..

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Update Time: 2024-10-02

This template belongs to Mathematics courseware Hebei Education Edition Ninth Grade Mathematics Volume 2 industry PPT template

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