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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