The random variable [tex][tex]$x$[/tex][/tex] represents the number of cars per household in a town of 1000 households.

a) Find the probability of randomly selecting a household that has less than two cars.
b) Find the probability of randomly selecting a household that has at least one car.
c) Find the probability of randomly selecting a household that has between one and three cars, inclusive.

\begin{tabular}{|c|c|}
\hline
Cars & Households \\
\hline
0 & 125 \\
\hline
1 & 428 \\
\hline
2 & 256 \\
\hline
3 & 108 \\
\hline
4 & 83 \\
\hline
\end{tabular}

ROUND TO THREE DECIMAL PLACES

a) [tex][tex]$P(x\ \textless \ 2)=$[/tex][/tex]



Answer :

Sure, let's go through the solution step-by-step. Given the probability distribution of the number of cars per household in a town of 1000 households:

[tex]\[ \begin{array}{|c|c|} \hline \text{Cars} & \text{Households} \\ \hline 0 & 125 \\ \hline 1 & 428 \\ \hline 2 & 256 \\ \hline 3 & 108 \\ \hline 4 & 83 \\ \hline \end{array} \][/tex]

a) To find the probability of randomly selecting a household that has less than two cars:

1. Identify the number of households with less than two cars. This includes households with 0 cars and 1 car.
2. Sum these households: [tex]\( 125 + 428 = 553 \)[/tex]
3. Calculate the probability by dividing by the total number of households (1000):

[tex]\[ P(x < 2) = \frac{125 + 428}{1000} = \frac{553}{1000} = 0.553 \][/tex]

Therefore, [tex]\( P(x < 2) = 0.553 \)[/tex].

b) To find the probability of randomly selecting a household that has at least one car:

1. Identify the number of households with at least one car. This includes households with 1, 2, 3, or 4 cars.
2. Sum these households: [tex]\( 428 + 256 + 108 + 83 = 875 \)[/tex]
3. Calculate the probability by dividing by the total number of households (1000):

[tex]\[ P(x \geq 1) = \frac{428 + 256 + 108 + 83}{1000} = \frac{875}{1000} = 0.875 \][/tex]

Therefore, [tex]\( P(x \geq 1) = 0.875 \)[/tex].

c) To find the probability of randomly selecting a household that has between one and three cars, inclusive:

1. Identify the number of households with between one and three cars. This includes households with 1, 2, or 3 cars.
2. Sum these households: [tex]\( 428 + 256 + 108 = 792 \)[/tex]
3. Calculate the probability by dividing by the total number of households (1000):

[tex]\[ P(1 \leq x \leq 3) = \frac{428 + 256 + 108}{1000} = \frac{792}{1000} = 0.792 \][/tex]

Therefore, [tex]\( P(1 \leq x \leq 3) = 0.792 \)[/tex].

So the results are:
a) [tex]\( P(x < 2) = 0.553 \)[/tex]
b) [tex]\( P(x \geq 1) = 0.875 \)[/tex]
c) [tex]\( P(1 \leq x \leq 3) = 0.792 \)[/tex]