Chapter 7, Problem 145CE

To determine

Calculate probability.

Explanation of Solution

Option (a):

The Probability of 5 or fewer adults who have confidence in a newspaper $\text{P}\left(\text{X}\le \text{5}\right)$ is 0.6167.

Option (b):

The probability of 5 or more adults who have confidence in a newspaper is calculated as follows:

$\begin{array}{c}\text{P}\left(\text{X}\ge 7\right)=1-\text{P}\left(\text{X}\le 6\right)\\ =1-0.7880\\ =0.2200\end{array}$

Probability is 0.2200.

Option (c):

The probability of exactly 5 adults who have confidence in a newspaper $\text{P}\left(\text{X}=\text{5}\right)$ is 0.1960.

Economics Concept Introduction

Probability: Probability is the numerical explanation for how many times an incidence will occur.