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Statistics Terms Statistics Formulas Counting Probability Graphs 1pt 1 pt 1 pt 1pt 1 pt 2 pt 2 pt 2pt 2pt 2 pt 3 pt 3 pt 3 pt 3 pt 3 pt 4 pt 4 pt 4pt 4 pt 4pt 5pt 5 pt 5 pt 5 pt 5 pt 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 to the 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 to greatest 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 of possibilities, 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 belts this is the total number of outfits you can make. 40 When order matters. Permutation 8 *7*6*5*4*3*2*1 could be rewritten as... 8! The number of ways 17 horses could finish 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 OR a 4 on one roll of a die. 1/3 When the outcome of one event does not affect the outcome of another event, the events are said to 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 if the first one is NOT replaced is... 2/21 The odds in favor of an event occurring is defined as... The ratio of the number of favorable outcomes to the number of unfavorable outcomes. The odds of flipping a coin and getting a head is... 1:1 The odds against an event occurring is defined as... The ratio of the number of unfavorable outcomes to the number of favorable outcomes. The odds AGAINST rolling a die and getting a 5 is... 5:1 The odds AGAINST rolling two dice and getting a sum of 7 is... 1:5
