Median: is the number in the middle when the set data set is in order
mode: it the number that occurs the most in the set
range:difference between the smallest and largest number
IQR: interquartile range is a measure of a data set separated into quartiles
Median is generally good if you have outliers (data points that are very far off from the majority of the points).
Mean can be used otherwise.
Find the perimeter when it says fencing 2(width + length)
Answer:
-439
Step-by-step explanation:
Think of the question as s(f(-7))
First replace x with -7 in the equation f(x)= 3x
s(-7) = 3*(-7)
s(-7) = -21
now it is s(-21)
we substitute -21 into the s(x) equation to get 
That gives you 2-441 = -439
