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To calculate the method, listen to the teacher and arithmetic mean is the same
First of all, the weight is the percentage of the whole. Multiply the weight (percentage) by the number to be weighted, and then calculate the arithmetic mean with other numbers
Remember to adopt it
How is the weighted average calculated?
Multiply each item by its percentage and add it up
Seeking the formula of weighted average
For example, the following is a classmate's examination results of a certain subject: the usual test 80, the midterm 90, the final 95. The calculation method of the school's prescribed subject score is: the usual test accounts for 20%; the mid-term score accounts for 30%; the final score accounts for 50%; here, the proportion of each score is called the weight or weight
Calculate the weighted average! The values are 1,2,3, and the weights are 0.25,0.25,0.5 respectively. Calculate the weighted average of this column of data!
Weighted average is the sum of the values multiplied by the corresponding weights
1x0.25+2x0.25+3x0.5=2.25
That is, the weighted average of the sequence is 2.25
How to use the percentage function on the calculator For example, 5 is how many percent of 100, how to calculate with a calculator I want to know what percentage of 63925 is 4404
This is not calculated by the function of that button. The method to calculate the percentage of a is B by using calculator: for example, if you use calculator to calculate 4404 × 63925 × 100, the result is: 6.89%, that is, 6.89% (% manually added, the calculator will not display, and the calculator will not calculate
How to calculate the ratio with a scientific calculator It's the use of scientific calculators. For example, 100 and 200 can't find out how to calculate 1:2 with scientific calculator/
2 / 5, first input the number "2", then press the "/" key, then press "5", and then "="
How does the calculator calculate the percentage? For example, I know what 92% of 16000 is? How to calculate with a calculator? Another example is 100 × 86%. How to operate a calculator? How to use calculator "percent sign key" to calculate?
It's very simple
For example, 2100 × 21%
Press 2100 × 21 and press%. (note that you don't need to press =)
How to use the percentage on the calculator
According to the number a, divide it by another number, and then divide it by another number, that is, multiply it by 50%, and then divide it by another number
How to use a percentage with an ordinary electronic calculator For example, 1-2%= It can't be calculated with an electronic calculator Only add, subtract, multiply and divide
2% can be understood as 2 ÷ 100
How to use a calculator to calculate the standard deviation,
I don't know if it's the same. Remember to pay attention to what is shown on the monitor
First enter the statistical mode, press the mode key (on the switch side) - 2 key,
Then input the value to be calculated. After each input, press DT (M + key, the one above AC)
After input
The sample standard deviation is
Shift (top left first) - s-var (digit 2) - digit 3
Overall standard deviation
Shift (top left first) - s-var (digit 2) - digit 2
average value
Shift (top left first) - s-var (digit 2) - digit 1
number
Shift (top left first) - s-sum (digit 1) - digit 3
and
Shift (top left first) - s-sum (digit 1) - digit 2
Sum of squares
Shift (top left first) - s-sum (digit 1) - digit 1
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