Question

A day of the week is chosen at random. What is the probability that it is a Wednesday or Saturday?A.2/7B.1/7C.2/14D. 2

Answer 1

ANSWER

$A)\frac{2}{7}$

EXPLANATION

There are 7 days in a week.

The probability that a chosen day of the week is Wednesday or Saturday is the sum of the probability that the day is a Wednesday and the probability that the day is a Saturday.

Since there is only one Wednesday in a week, the probability that the day is a Wednesday is:

$P(W)=\frac{1}{7}$

The same rule applies for Saturday:

$P(S)=\frac{1}{7}$

Therefore, the probability that the day is a Wednesday or a Saturday is:

$\begin{gathered} P(W-or-S)=\frac{1}{7}+\frac{1}{7} \\ P(W-or-S)=\frac{2}{7} \end{gathered}$