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StatisticsTerms
Statistics Formulas
Counting Probability Graphs
The same as the average.
Mean
The middle term in a set of data.
Median
The term that means the “most.”
Mode
The median of the upper half.
Upper Quartile or Q3
Extreme numbers compared tothe rest of the data.
Outliers
The Range
Highest - Lowest
The Mean
Add all numbers and divide by the total number of items.
The Median
Put numbers in order from least togreatest and take the number in
the middle.
Interquartile Range
Q3 - Q1
Outliers
1.5 x interquartile range.Subtract from Q1 and add to Q3.
Formula for finding the total number ofpossibilities, or the Fundamental
Counting Principle.
The number of ways the first event can happen times the number of ways the
second event can happen, etc.
If you have 5 shirts, 4 pants, and 2 beltsthis is the total number of outfits you
can make.
40
When order matters.
Permutation
8 *7*6*5*4*3*2*1could be rewritten as...
8!
The number of ways 17 horses couldfinish 1st, 2nd, and 3rd in the
Kentucky Derby.
4080
The probability of an event is defined as...
The total number of favorable outcomes divided by (over) the
total number of possible outcomes.
The probability of rolling a 3 ORa 4 on one roll of a die.
1/3
When the outcome of one eventdoes not affect the outcome of
another event, the events are saidto be...
Independent
The probability of tossing a coin and getting a tail AND of rolling a die and
getting a 2.
1/12
If a bag contains 5 red, 3 blue, and 7 yellow marbles, the probability of
of randomly selecting a 2 red marbles ifthe first one is NOT replaced is...
2/21
The odds in favor of an eventoccurring is defined as...
The ratio of the number of favorableoutcomes to the number of unfavorable
outcomes.
The odds of flipping a coinand getting a head is...
1:1
The odds against an event occurringis defined as...
The ratio of the number of unfavorableoutcomes to the number of favorable
outcomes.
The odds AGAINST rolling a dieand getting a 5 is...
5:1
The odds AGAINST rolling twodice and getting a sum of 7 is...
1:5