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"Stability of Frequency" Probability Preliminary PPT Download
Part One: Learning Objectives
1. Through the activities of tossing thumbtacks and coins, you can experience the process of guessing, experimenting, collecting test data, analyzing test results, etc., and gain a preliminary understanding of the relationship between frequency and probability.
2. Through experiments, we can feel that the frequency of random events is stable when the number of experiments is large.
3. Understand the meaning of probability and be able to estimate the probability of certain events based on their frequency.
Frequency Stability PPT, Part 2: Classic Examples
[Example 1] In a large number of repeated experiments, regarding the frequency and probability of random events, which of the following statements is correct ()
A. Frequency is probability
B. Frequency has nothing to do with the number of trials
C. Probability is random and has nothing to do with frequency
D. As the number of trials increases, the frequency will generally become closer and closer to the probability
[Example 2] A certain unit wants to select one of the two shooting team members to participate in the competition. It is known that under the same conditions, A is more likely to hit something than B, then the selected person should ()
A.Choose A B.Choose B
C. It’s OK D. Not sure
[Example 3] There are n small balls that are identical except for color in an opaque box, including 6 yellow balls. Shake the balls in the box well before touching the ball each time, and note down any ball you find. After coloring, put it back into the box. After a large number of repeated ball touching experiments, it was found that the frequency of touching the yellow ball was stable at 30%. Then it can be deduced that n is approximately ()
A.6 B.10
C.18 D.20
Frequency Stability PPT, Part 3: Variation Practice
1. Use frequency to estimate probability. It can be found that when a coin is tossed, the probability of "heads" is 0.5, which means ()
A. Toss twice in a row, the result must be "heads up" and "tails up" once each
B. Toss 100 times in a row, the result must be "heads up" and "tails up" 50 times each
C. Toss a coin 2n times, and there will be exactly n "heads"
D. Toss n times, as n gets larger and larger, the frequency of heads will become more and more stable at 0.5
2. As shown in the figure, when the turntable is rotated, the possibility of the pointer pointing to the shaded part is a, and the possibility of pointing to the blank part is b, then ()
A.a>b B.a
3. It is known that a bag contains 2 red balls, 3 white balls and a yellow ball. These balls are all the same except for the color. If a ball is randomly picked out from the bag, the probability of it being a red ball is 1/3, then a is equal to ()
A.1 B.2
C.3 D.4
Frequency Stability PPT, Part 4: Consolidation Training
4. In order to determine the probability of the thumbtack hitting the ground after the thumbtack hits the ground, Xiao Ming did a lot of repeated experiments and found that the number of times the thumbtack touched the ground was 40% of the total number of tests. Which of the following statements is wrong ()
A. The frequency of nail tip hitting the ground is 0.4
B. As the number of tests increases, the frequency of nail tip landing stabilizes at around 0.4
C. The probability of the nail tip hitting the ground is about 0.4
D. After the first 20 tests, the number of times the nail tip touches the ground must be 8 times
5. Xiao Ming practiced shooting and shot 60 times in total, 38 of which hit the target. From this, it can be estimated that the frequency of Xiao Ming hitting the target in one shot is approximately ()
A.38% B.60%
C.63% D.Unable to determine
6. Among the following events, the event with probability between 0 and 1 is ()
A. 3 people are divided into two groups, one group has two people
B.The sun will rise from the west tomorrow
C. Xiao Ming bought a lottery ticket and won the first prize
D. People always need to drink water
Keywords: Free download of Beijing Normal University version of seventh grade mathematics volume 2 PPT courseware, frequency stability PPT download, probability preliminary PPT download, .PPT format;
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"Stability of Frequency" Probability Preliminary PPT Teaching Courseware:
"Stability of Frequency" Probability Preliminary PPT Teaching Courseware Part One Content: Learning Objectives Understand the concept of frequency. (Key Points) Understand that the frequency of random events is stable when the number of trials is large. (Difficulty) ... .. . ... frequency stability..
"Stability of Frequency" Probability Preliminary PPT:
"Stability of Frequency" Probability Preliminary PPT Part One Content: Teaching Objectives 1. Through the activities of tossing thumbtacks and coins, you will experience the processes of guessing, experimenting, collecting test data, and analyzing test results, and gain a preliminary understanding of the relationship between frequency and probability. 2. Through experiments, I feel...
"Stability of Frequency" Frequency and Probability PPT Courseware 4:
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