Question

4. A recent poll showed that 87.4% of people own a cell phone. What is the probability that someone does not own a cell phone?
A. 1.260
B. 0.913
C. 0.126
D. 0.874

Answer 1

Answer: the pollsters would be 95% confident that the true proportion of voters who favored the candidate would be between 0.37 and 0.43: (0.40 – 0.03,0.40 + 0.03)

Step-by-step explanation:

Answer 2

0.126. A recent poll showed that the probability that someone does not own a cell phone is 0.126 which represent the 12.6% of the poll.

Let's supposed that the poll was made to 100 people, which means 87.4 people own a cell phone. On the other hand, the people who do not own a cell phone is 100 - 87.4 = 12.6 pleople.

The key to solve this problem is using the equation of probability $P(A)=\frac{n(A)}{n}$ where n(A) is the number of favorables outcomes and n is the total number of outcomes.

The probability that someone does not own a cellphone is 12.6 peoples (favorables outcomes) from a total of 100 people (total outcomes).

Solving the equation:

$P(A)=\frac{12.6}{100}=0.126$