Basics

Question 1

Mean definition

Answer 1

Mean, or average, takes the sum of all the numbers in a data set and divides them by the number of data points ex: mean of 10 and 20 is 15 as 10+20/2 = 15

Question 2

The Median

Answer 2

The middle number if we lined up our data from smallest to largest, ex in a data set of 15 numbers, the 8th number is our median. if there is no clear middle number, take the two middle numbers and do their average, this is the mean

Question 3

Normal distribution

Answer 3

Data is normally distributed if it has roughly the same amount of data on either side of the middle

Question 4

How to move from decimals to % for ex: 0,251 in %

Answer 4

Multiply decimal per 100% or move decimal two times to the right, here 25,1%

Question 5

Order of operation priorities is

Answer 5

Please Excuse My Dear Aunt Sally (Parenthesis, exponents and roots, Multiply, Divide, Add, Substract)

Question 6

Simplifying a fraction method

Answer 6

Find greatest common nominator and denominator, then divide both num/denum by greatest common factor. To find GCF: remember YouTube technique. For 24 you will do 24= 1x24 then 24/2=12 so 24= 2x12 then 24/3=8 so 24= 3x8 etc..

Question 7

How to you find the percentage of a number, ex: how much is 254 of 4520 in %

Answer 7

Do Dora’s crossed technic “ out of 4520 , 254 so out of 100, how much “ you then multiple 100x254 divided per 4520 = 5.62%