8-73April+T

[|**My scribe**] [|**My Growing Post**] [|**My B.O.B**] = = =1. Mean, Median, and Mode= How do you calculate them?


 * Mean: Add the numbers in the data set. divide the sum by the number of numbers in the data set. Mean also means finding the average of a data set.**

//__data set 1:__ __4, 5, 6, 2, 6, 1, 6__//** To find the mean of this data set first you have to add up all the numbers in the data set. __**//4 + 5 + 6 + 2 + 6 + 1 + 6 = 30//**__ You then take the sum of all data which is 30 and divide it by the number of pieces in the data set which is 7. __**//30/7 = 4.28//**__ therefore **__//4.28//__** is the mean.
 * example:

If there is an even amount of numbers, you take the 2 middle numbers, add them, then divide by 2 and there's your median.**
 * Median: The middle number of the set of numbers. The set of numbers must first be in numerical order from smallest to largest.

//**__data set 2:__ __2, 4, 5, 7, 6, 8, 9,__**// Finding the median of a data set is really quite easy. You first put the data set into numerical order so its easier for you to find your median. Numerical Order: 2, 4, 5, 6, 7, 8, 9 Now you look for the median which is really just the middle number.
 * example:**

example:** //__**data set 3:**__ __**2, 4, 2, 6, 7, 2, 8**__// The mode of this data set would be 2 because as you can see, the number 2 is the most common number in this data, therefore making it the mode.
 * Mode: The is really just the most common number.

There can also be more than one mode in a data set. Even though one mode can be more common than the other they are still both modes. //**__data set 4:__** __**3, 5, 1, 5, 2, 1, 5, 6, 5, 8**__//
 * example:**

As you can see, there is more than one common number in this data set.

Find the Mean, Median, and Mode. Put in numerical order. 8, 4, 3, 3, 5, 7, 1**
 * QUESTION 1

8+4+3+3+5+7+1 =31 31/7 = **4.42** 4.42 is the mean.
 * Mean**

1 3 3 **4** 5 7 8 The median is 4.
 * Median**

the mode is **3**
 * Mode**

**873ATAnswers**

=2. Square Roots=

Definition: Perfect Square: a "whole number" that can be multiplied by itself. No decimal numbers.

A perfect square chart that shows you all the numbers that can be divided by themselves. 1x1=1 2x2=4 3x3=9 4x4=16 5x5=25 6x6=36 7x7=49 8x8=64 9x9= 81 etc ...**
 * __example:__

Square Root: a number that is multiplied by itself. There may be a decimal if it is not a number from the perfect square chart.


 * What is the Square Root of 45?**

873ATAnswers

=3. Percent=

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

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=4. Ratio Proportion Question=

a) If 4 pounds of bananas cost $14. How much would 7 pounds of bananas cost?

b) A child can run 5 blocks in 10 minutes. How long does it take the child to run 8 blocks at the same speed?

=5. Ratio Proportion Question 2= b) A child can run 10 blocks in 5 minutes. How long does it take the child to run 7 blocks, at the same speed.

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