Mean Median Mode

Mean - you add all the numbers and divide by the number of data
example: 1, 2, 3, 4, 5
1+ 2 + 3 + 4 + 5 = 15
15 ÷ 5 = 3 (3) is the mean

Median - is the middle number, if there is 2 middle numbers, you add them together, divide it by 2 and you will get the median
example # 1: 1, 2, 3, 4, 5 <<< 3 is the middle number, the median
example # 2: 1, 2, 3, 4, 5, 6 <<< 3 and 4 is the middle number
3 + 4 = 7
7 ÷ 2 = 3.5 (3.5) is the median

Mode - the number that appears the most, if there is 2 numbers that appear the most, both is the mode.
example # 1: 2, 3, 4, 3, 3, 5 = number 3 shows up the most times, it is the mode
example # 2: 4, 2, 5, 6, 4, 5 number 4 and 5 shows up the most, both is the mode
HINT: 1, 2, 3, 4, 5 ( this does not have a mode)

Numerical Order - putting the numbers in an ascending or descending order
example: 2, 3, 1, 4, 2, 5
numerical order: 1, 2, 2, 3, 4, 5

1. Find the mean, median and mode for:
  • remember to put it in numerical order
7 6 5 4 9 5 1
write you answer here :


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Square Root - is a number that can times by itself.
example: the number 8's square root is 4 ( 4 x 4 ), square root of 81 is 9 ( 9 x 9)

Perfect Square - any square that has the same whole number for all sides.

  • If you have to find a square root for a number that is not on the square root chart, you have to look at the number before and after it. Then you find the square root for the before and after number. Then that must mean that the square root of the number that isn't on the chart is in the middle of the before and after number.
example: find the square root for 38 (that is not on the square root chart)
number before 38 is 36 number after 38 is 49

36 = 6 x 6
38 = 6. ? x 6. ?
49 = 7 x 7


To find the fraction - this is for the number that is not on the square root chart. You have to take the whole number, then you take the before number and subtract it from the after number. The answer that you get will be your denominator. Then you count, starting from the number after your before number, until you reach the number that you are finding the fraction for. When you reach it, put the number that you counted when you reached the number to be the numerator of your fraction. Your fraction should be a mixed fraction.
example: fraction for 38 <<< square root for this number is 6. ? <<< 6 will be the whole number for the fraction
number before: 36 number after: 49

49 - 36 = 13 (13 is the denominator)
37 = 1
38 = 2 ( 2 is the numerator)

6 2÷13 is the fraction

square root chart:
FACTORS:
AREA:
1 x 1
1 unit ²
2 x 2
4 unit ²
3 x 3
9 unit ²
4 x 4
16 unit ²
5 x 5
25 unit ²
6 x 6
36 unit ²
7 x 7
49 unit ²
8 x 8
64 unit ²
9 x 9
81 unit ²
10 x 10
100 unit ²



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What's the square root of 72 ?

answer here:




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Percent

To find the percent of any number..
--Example-- find 12% of 100

-- take number your trying to find the percent of and divide by 100. (100/100=1)
-- then multiply that by the number you want to find. (100x12=12)
-- so 12 is 12% of 100.





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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?

Answer here:




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Ratio and proportions
Ratio table - a t-chart that represents kind of a fraction, the part is on one side and the whole or total is on the other

4. If 5 bags of sweets contain 80 sweets in total, caculate how many sweets are in 14 bags ?
  • Solve in a ratio table

Answer here:




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5. What is the missing measure ? Solve with fractions

10 cm for the top and bottom sides
7 cm for both sides

14 for both sides
what is the size for the top and bottom sides ?

answer here:




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