If A is one number and B is the other then a number of the form x*A + (1 - x)*B is between A and B for any x such that 0 < x < 1.
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There are infinitely many numbers between any two different numbers. To find a number exactly in the middle between two numbers, calculate the average. That is, add the two numbers, then divide the result by 2.
To find the number between two other numbers be find their mean or average. To do this we add the numbers and divide by the number of numbers we have, 2 in this case.13+6= 1919/2= 9.59.5 (that's nine and a half) is midway between six and thirteen.
In order to find the percentage increase and decrease between to numbers are easy. All you have to is subtract the number you start out with to the number it becomes.
mode is the number that occurs the most and to find the mean/average, add all numbers, then divid that number by the number of numbers there were in your group of numbers.
Line up the decimal points and then subtract one from the other.