Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

A list of all possible values of the discrete random variable X, together with their associated probabilities, is called a probability distribution. It is often

A list of all possible values of the discrete random variable X, together with their associated probabilities, is called a probability distribution. It is often helpful to show the probability distribution in a table.

Stephanie is very forgetful. Every time she logs in to her online bank she only has a 40% chance of remembering her password correctly. She is allowed 3 unsuccessful attempts on any one day and then the bank will not let her try again until the next day.

(a) Draw a fully labelled tree diagram to illustrate this situation.

(b) Let X be the number of unsuccessful attempts Stephanie makes on any day that she tries to log in to her bank. Construct a table to show the probability distribution of X.

(c) Calculate the expected number of unsuccessful attempts made by Stephanie on any day that she tries to log in.

(d) Calculate variance.of X.

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

College Algebra

Authors: Robert F Blitzer

7th Edition

013449492X, 9780134453262

More Books

Students also viewed these Mathematics questions