Find the indicated probability by using the special addition rule.
-A percentage distribution is given below for the size of families in one U.S. city.
$\begin{array} { l c }
\text { Size } & \text { Percentage } \
\hline 2 & 49.6 \
3 & 24.6 \
4 & 13.4 \
5 & 7.3 \
6 & 3.1 \
7 + & 2.0
\end{array}$
A family is selected at random. Find the probability that the size of the family is at most 3. Round approximations to three decimal places.
A)0.742
B)0.258
C)0.246
D)0.496

Question

Find the indicated probability by using the special addition rule.
-A percentage distribution is given below for the size of families in one U.S. city. 
$\begin{array} { l c } 
\text { Size } & \text { Percentage } \
\hline 2 & 49.6 \
3 & 24.6 \
4 & 13.4 \
5 & 7.3 \
6 & 3.1 \
7 + & 2.0
\end{array}$ 
A family is selected at random. Find the probability that the size of the family is at most 3. Round approximations to three decimal places. 
A)0.742
B)0.258
C)0.246
D)0.496

Quizplus · Accepted Answer

The probability that the size of the family is at most 3 is the sum of the probabilities of having a family size of 2 or 3, which is 49.6% + 24.6% = 74.2% or 0.742 when expressed as a decimal.

Find the Indicated Probability by Using the Special Addition Rule