Bayes Formula. P (A) = Number of favorable outcome / Total number of favorable outcomes. To calculate the probability that a value equals 4, use the formula. ... You use some combinations so often that they have their own rules and formulas. Independent Events. Introduction to Probability and Combinatorics. =PROB (A1:A10,B1:B10,4) In what shouldn’t be a surprise to you, given the value shown in cell B4, this function returns the value 15.00%, as shown in cell G3 here. Conditional Probability. n (A) is the number of favourable outcomes. This is an 10-page probability cheatsheet compiled from Harvard's Introduction to Probability course, taught by Joe Blitzstein (@stat110). List of Basic Probability Formulas. Rule of Complementary Events. Probability For Dummies Cheat Sheet; Cheat Sheet. Disjoint Events. The probability formula sheet summarizes important probability probability concepts, formulas, and distributions, with figures, examples, and stories. Or, P (A) = n (A)/n (S) Where, P (A) is the probability of an event “A”. Note: Here, the favourable outcome means the outcome of interest. The formula of the probability of an event is: Probability Formula. Rule of Addition. The complete list of statistics & probability functions basic formulas cheat sheet to know how to manually solve the calculations. Users may download the statistics & probability formulas in PDF format to use them offline to collect, analyze, interpret, present & organize numerical data in large quantities to design diverse statistical surveys & experiments. In the following sections, we are going to keep the same notations as before and the formulas will be explicitly detailed … The better you understand the ideas behind the formulas, the more likely it is that you’ll remember them and be able to use them successfully. Probability and Distributions PA B PA PB PA B ( ) ( ) ( ) ( ) ∪= + − ∩ ( ) ( ) ( ) | PA B P AB PB ∩ = Probability Distribution Formulas and Tables for AP Statistics I. Descriptive Statistics 1 i i x xx nn ∑ =∑= ( ) ( ) 2 1 2 1 1 i xi xx s xx n n ∑− = ∑− = − − y a bx ˆ = + y a bx = + 1 1 ii xy xx y y r n ss −− = ∑− y x br s = s II. A worksheet fragment for demonstrating the PROB function. Probability Range. n (S) is the total number of events in the sample space.