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10 Cards in this Set
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If a set of objects is divided into 2 groups in the ration of a:b, then what does each group contain?
What if there are 3 groups? |
___a___
a+b and the second group contains ___b___ a+b Same logic but |
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If we know a ratio can we determine how many objects there are?
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Nope!
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With Average questions, what is the first thing to do?
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The is to find the sum of the numbers first. A = sum over n, so multiplying both sides by n yeilds the equation sum = nA
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If you know the avergard of a set of numbers, how do you find out the sum?
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A = sum over n, so multiplying both sides by n yeilds the equation sum = nA
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If all numbers in a set of numbers are the same, what is the average?
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That number
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If all the numbers in a set of numbers are not the same, the number must be less than and greater than what?
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Greater than the smallest number and less than the largest number.
Equivalently, at least one of the numbers will be less than the average and at least one of them is greater. |
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What is a deviation? What is it equal to?
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The differences between a number and the average. The total deviation below the avergae is equal to the total deviation above the average.
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What is an arithmetic sequence?
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The difference between any two consecutive terms is the same
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When you have two arithmetic sequences with and n is odd, what is the average of the numbers?
If n is even? |
The middle term in the sequence
The average of the two middle terms |
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What is a weighted average?
How do you calculate it? |
When two averages are given two different weights in calculation.
Multiple each number in the set by the number of times it appears, add all the products, and divide by the total number of numbers in the set. |
