• 0
Votes
name

A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 212

Backtrace:

File: /home/mycocrkc/statisticsanswered.com/application/views/question.php
Line: 212
Function: _error_handler

File: /home/mycocrkc/statisticsanswered.com/application/controllers/Questions.php
Line: 416
Function: view

File: /home/mycocrkc/statisticsanswered.com/index.php
Line: 315
Function: require_once

Suppose that the probabilities of a customer purchasing​ 0, 1, or 2 books at a book store are 0.3​, 0.3​, and 0.4​, respectively. What is the standard deviation of this​ customer's book​ purchases?

x p x.p x.^2.p
0 0.3 0 0
1 0.3 0.3 0.3
2 0.4 0.8 1.6
       
sum   1.1 1.9
       

Standard deviations = sqrt(1.9 - 1.1^2) =   0.831

  • 0
Reply Report