conditional probability tutorial

EX1:Joey 80% sure he put the missing key in one of the two pockets of his coat. He was 40% sure to put it in the left pocket and 40% OK in the right pocket. If you check the left pocket and find that the key is not found, then what is the condition probability of the key in the right pocket?Analysis: Very basic conditional probability of the problem, the key to s

1. Conditional Probability Define a and B as two events, and P (a)> 0 is called P (B bought a) = P (AB)/P () It is the probability of occurrence of condition Event B Under Condition.2. Multiplication Formula Set P (a)> 0 P (AB) = P (B represents a) P ()3. Full probability formula and Bayesian Formula Defin

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Example 1b a jar with a ball numbered 1-20, no back to extract 3, take out the ball at least one number greater than or equal to 17 probability is what?In addition to the solution in the book, there is a solution:Consider the opposite: the number of three balls is less than 17.The first time from the number 1-16 to take one, 16 kinds of extraction, the remaining 15 balls;The second time from the number 1-16 to take one, 15 kinds of extraction, the rem

of parameter 1 is greater than or equal to parameter 2 Example:#!/bin/bashdeclare i lenlen=$1if [$len-eq 100]; Thenecho ' length of ' elseecho ' length is not 100, but $len "fiRow 4, the command-line positional parameter, gets the value of Len's variable.4. Conditional Judgment on bash options Serial Number Judging Type under what circumstances is true 1 -O SET option name If this option i

have to worry about the effects of some bash special characters on the operator, do not write a bunch of escape characters, such as [[Str In addition to [[]], in bash, there is no need to ignore the effects of the special characters mentioned above.Below, there is another point to pay special attention to:In [[judging]] , if you use = = or! =, and the string to the right of the two operators does not add single or double quotes , then = = and! = are considered to be the "style" that you want to

VB tutorial> Lesson 7 use conditional statementsControlProgramRun Conditional statements and cyclic statements can be used to control the script process. You can use conditional statements to write VBScript for judgment and repeated operations.Code. The following conditions can be used in VBScript: · If... then...

( //add a line of logs alert ( ' teenager ' Code class= "JavaScript plain"); // the Else clause of the above code is actually only responsible for executing console.log (' Age , the original alert (' teenager '); no longer belong to If...else ... control, and it executes every time. Multi-line condition judgmentIf you want to judge the condition more carefully, you can use multiple if...else ... Combination of:[JavaScript]Plain Text view copy code ? 00100200300400

range (1): = sqrt ( N)if root = = Int (root): Print N Break Else : Print " didn ' t dind it! "Results>>>Didn ' t dind it! List derivation--lightweight loops A list derivation is a way to create a new list with other lists, such as>>> [(x, Y) for x in range (3) for Y in range (3)][(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2), (2, 0), (2, 1)]>>> girls = [' Alice ', ' Bernice ', ' Clarice ']>>> boys = [' Chris ', ' Arnold ', ' Bob ']>>> [B + ' + ' +g for

:print ' The number is positive 'Elif num print ' The number is negative 'Elseprint ' The number is zero '_______________________________　　The = = Budget character Determines whether 2 objects are equal, and is to determine whether the two are equivalent (the same object)An Assert statement is available if you need to make sure that a condition in the program must be true for the program to function4. CirculationWhile loopWhile xPrint XX=x+1For loopwords=[' This ', ' was ', ' an ', ' ex ', ' Par

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In writing a shell script, there may be a situation when you need to take a path of two paths. So, you need to use conditional statements to make the program make the right decisions and perform the right actions. The UNIX shell supports conditional statements, which perform different operations under different conditions. Here, we will explain the following two decision statements: ·

Tags: io ar strong SP data on CTI BS newSimilar to the normal relational database, when the data is deleted, changed, check, you will use the query conditions, such as the Where in MySQL ...In MongoDB, all the instructions that have been made by PHP are wrapped in arrays:Mongocollection::update ( array $criteria , array $newobj [, array $options = Array ()])Public Mongocursor Mongocollection::find ([ Array $query = array () [, Array $fields = Array ()]])Public array Mongocollection::findone ([ A