Question

According to the Girl Scouts of America, 9% of all Girl Scout cookies sold are shortbread/ trefoils. If a box of Girl Scout cookies is selected at random, what is the probability that it is not shortbread/trefoils?

Short answer

The probability is$0.91$

Step-by-step solution

Step 1. Given Information 

The given data is that 9% of all Girl Scout cookies sold are shortbread/ trefoils.

Step 2. Explanation

If E represents an event and $\overline{E}$represents the complement of E then $P\left(\overline{E}\right)=1-P\left(E\right)$. It is given that$P\left(E\right)=0.09$

Substitute the values in the formula to find the required value.

$$\begin{gathered} P\left(\overline{E}\right)=1-P\left(E\right) \\ =1-0.09 \\ =0.91 \end{gathered}$$