Question

Each child in a class of 42 was asked to report how many pets (cat or dogs) that he orshe has. The data are summarized in the table below.Based on the data, estimate the probability that a randomly selected student fromthis class has 2 or more pets.A. 11/42 or approximately 0.26B. 15/42 or approximately 0.36C. 27/42 or approximately 0.64D. 38/42 or approximately 0.90

Answer 1

Step 1

State the formula for the probability of an event

$Pr(event)=\frac{required\text{ number of events }}{Total\text{ number of events}}$

The required number of event= The students with 2 or more pets= 15+7+3+2+0 = 27

Total number of events=4+11+15+7+3+2+0=42

Step 2

Estimate the probability that a randomly selected student from this class has 2 or more pets.

$Pr(Students\text{ with }2\text{ pets or more})\frac{27}{42}\approx0.64$

Answer; Option C 27/42 or approximately 0.64