On a popular app, users rate restaurants as 1 , 2 , 3 , 4 , or 5 stars. Suppose a rating is randomly selected from all the ratings on the app. Let X be the number of stars of the selected rating. Here is the probability distribution of X . Value x of X 1 2 3 4 5 P=Xx 0.23 0.18 0.11 0.26 0.22 For parts (a) and (b) below, find the probability that the randomly selected restaurant rating has the described number of stars. (a) 3 or more: (b) Fewer than 4 :

On a popular app, users rate restaurants as 1 , 2 , 3 , 4 , or 5 stars. Suppose a rating is randomly selected from all the ratings on the app. Let X be the number of stars of the selected rating. Here is the probability distribution of X . Value x of X 1 2 3 4 5 P=Xx 0.23 0.18 0.11 0.26 0.22 For parts (a) and (b) below, find the probability that the randomly selected restaurant rating has the described number of stars. (a) 3 or more: (b) Fewer than 4 :

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

On a popular app, users rate restaurants as

, or

stars. Suppose a rating is randomly selected from all the ratings on the app. Let

be the number of stars of the selected rating. Here is the probability distribution of

Value x of X	1	2	3	4	5
P=Xx	0.23	0.18	0.11	0.26	0.22

For parts (a) and (b) below, find the probability that the randomly selected restaurant rating has the described number of stars.

(a)

or more:

(b) Fewer than

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