"Use Calculator to Calculate Mean and Variance" PPT courseware

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"Use Calculator to Calculate Mean and Variance" PPT courseware

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What is extremely poor? What is variance?

(1) Range = maximum value – minimum value.

(2)The variance is:

Explore new knowledge

Practice: find the mean and variance of each set of data below

(1)1,3,6,2

(2)1,13,16,20

Finding the variance requires a large amount of calculations. When a set of data contains a large number of numbers, it takes a lot of time to find the average and variance, and it is easy to make mistakes. Therefore, it is usually not necessary to do calculations in writing but to rely on scientific calculations. calculator, let's learn to use the calculator to find the mean and variance of a set of data.

Consolidation exercises

1. The following table gives the closing prices of the two stocks from April 1 to April 19, 2002. Calculate their average and variance respectively, and compare the rise and fall of the two stocks during this period. Amplitude of change.

Solution: The average price of A stock is approximately 11.72. The variance is about 0.102; the mean of B stock prices is about 14.16 and the variance is about 0.175. The overall price fluctuation of stock B is larger than that of stock A.

2. By using a calculator to compare the size of fluctuations in two sets of data, simply compare their ____ ( )

A. VarianceB. average c. median

3. Use a calculator to calculate the variance of samples 91, 92, 90, 89, and 88 as ____

4． Use a calculator to calculate the average of 7, 8, 8, 6, 5, 7, 5, 4, 7, 6 as ( )

A. 6 B. 6.1 C． 6.2 D. 6.3

In-class activities

Group activity: In groups of four, measure the length of each student and find the corresponding average and variance.

Operation

Measure the height of each student as a group and find the variance

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"Use Calculator to Calculate Mean and Variance" PPT Courseware 2:

"Use Calculator to Calculate Means and Variances" PPT Courseware 2 Think about it 1. Four classes in the third grade of a school participated in tree planting activities. It is known that the number of trees planted by the four classes on the same day was 50, 50, 40, x , if the mode and mean of this set of data are exactly equal, then this set of numbers...

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Update Time: 2024-10-01

This template belongs to Mathematics courseware Qingdao Edition Eighth Grade Mathematics Volume 1 industry PPT template

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