841Sarika+S


 * Measure of Central Tendency

__Mean, Median, and Mode__**

First thing you do before define what the mean, median, mode is putting it in ascending order

To find the **Mean** you have to add all the numbers together and divide by the set of Data there is

example: 3, 5, 6, 7,8

3 + 5 + 6 + 7 + 8 = 29 29/5 = 5.8

To find the **Median** you have to find the middle number. But if there is two middle numbers you have to add both the numbers and divide by two

example: 3, 5, 6, 7, 8, 9 3, 5, **6, 7,** 8, 9 the two number that are in bold are the middle numbers and you want one number so you have to find the mean of it

6 + 7= 13 13/2 = 6.5

To find the **Mode**, you want to see what number shows up more then the rest of the data, and there can be more then one mode or no mode

Example: **3, 3**, 4, 7, 9 or **3, 3**, 4, **7, 7**, 9 or 3, 4, 7,9

You want to find the Mean, Median, Mode for theses numbers, 75, 22, 31, 69, 31, 72, 88, 13

13, 22, 31,31,69,72,75,88

mean = 50 median = 50 mode = 31

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__**Square Root & Perfect Squares**__

To find spuare root by fraction you find the two numbers in between the number thats given to you. Take those two numbers and subtract it. Then you take the square root that given to you and subtract the smaller number thats in between the square root. Then after you need to find the whole number. To do that you take the smaller number and see what it was equal to.

Example: the square root for 259

first step 16 x 16 = 256 17 x 17 = 289

second step 289 - 256 = 35 259 - 256 = 5

and the answer is 16 and 5/35

To find a perfect square you need to know the square root is two of a same fraction times it self.

Example: 2 x 2 = 4 a perfect square

1, 4, 9, 16 are some of the perfect squares

find the square root of

a)69 = 8 and 5/17

b)31= 5 and 6/11

c)117= 10 and 17/21

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 * __Percent__**

percent is an equivalent of a fraction.To find a percent you have divide N/D x 100 = Percent

Try to figure this out

Is taking 15% off a given item and then an additional 10% off the reduced price the same as taking 25% off the orignal price? Why or why not.

no because the differnce is 50 cents between both

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__**Proportion and Ratio**__

To find porportion and ratio there are three way to find it by equivalent fraction, xky chart, and porportion and ratio chart


 * How to find equivalent fraction here are some steps**

STEP 1 Fill in the two fractions with the informations you have.

STEP 2 Part is the numerator and total is the denominator.

STEP 3 Find what the relationship of the two numerators and the two denominators.

STEP 4 Find what is the relationship between the numerator and denominator of ecah fraction

EXAMPLE

If 7 Candy bags cost 15 dollars, calculatehow many 10 candy bags cost ?

to find that go Part/Total = Bags/ Cost

Part/Total = 7/15 now you have to find the difference betweem the numbers is 2.1

10/? after you find the difference of part/total you do the same for Bags/Cost = 21

Now you want to know what the differnce of Part/bags so you now know it is correct = 1.4

after you do that, you do the same for total/cost =1.4

and then you will have your answer = 21


 * How to find xky**

If 7 Candy bags cost 15 dollars, calculatehow many 10 candy bags cost ?

X===K===Y 7 l x 2.1 l = 15 10 l x 2.1 l = 21

= B [] C /7 7 [] 15 /7 = 1 [] 2.1 x10 x10 100 [] 21

the answer is 51

Qustion 5) find what x is

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