1
answer
193
views
12
Problem

For access to Textbook Solutions, a Class+ or Grade+ subscription is required.

Textbook Expert
Textbook ExpertVerified Tutor
25 Oct 2021

Given information

Given that Ellen has music practice three days a week. She practices for all of the three days 85% of the time, two days 8% of the time, one day 4% of the time, and no days 3% of the time. One week is selected at random.

The main objective is to We know that for a probability distribution function to be discrete, it must have two characteristics. One is that the sum of the probabilities is one. What is the other characteristic?

Step-by-step explanation

Step 1.

From the definition of a probability distribution function , it must satisfies the two conditions .

Let X be the  random variable that gives the number of days in a week.

Let be the probability that she practices for X days.

The probability distributive function table is shown below:

 

 

Unlock all Textbook Solutions

Already have an account? Log in
Start filling in the gaps now
Log in