Median and Range

 Today's lesson is all about median and range. 

Median : is the middle number in a given set of data.

example: 9,5,6,8,3

Step 1: Rearrange the numbers from least to greatest.

Step 2: 3,5,6,8,9

Step 3: Cross off the numbers starting from left, then right, left then right, until you come up with only 1 number

3,5,6,8,9  In my case I underlined and made the numbers darker. So, the middle number here is 6.  The median is the #6.

In some situations there maybe more than 1 number. If there are two middle numbers, you add both of them and divide by 2 to get your median.

ex. 4,1,7,6,2,8

Step 1: Rearrange the numbers from least to greatest.

             1,2,4,6,7,8

Step 2: Cross off the numbers starting from the left to right, left, to right.

In my case, I will make the numbers darker and underline them.

            1,2,4,6,7,8

Because there are two numbers left 4,6,you add the two 4+6=10 , then divide by 2,

10/2= 5. The median is 5. 

Remember that you can use a calculator. 

Range: to find the range of a given data, you take the highest number and subtract it from the least number.

ex. 95,92,87,85,80,78,76,73,72,70,66,54

Step 1: Rearrange the numbers from least to greatest.

Step 2: 54, 66,70,72,73,76,78,80,85,87,92,95

Step 3: Look for the highest number which is 95, look for the smallest number which is 54.

Step 4: Subtract the two numbers: 95-54= 41

The range is 41.