Chapter 13.3, Problem 56AYU

To determine

To find: The probability that the box selected in random is not shortbread trefoils.

Answer to Problem 56AYU

The required probability is $0.91$ .

Explanation of Solution

Given:

The percent of Girl Scout cookies of shortbread/trefoils sold is 9%.

Calculation:

The probability of the event is,

  $P\left(E\right)=0.9$

Then, the probability that the US adult has never spent money on gambling online is,

  $P\left(E^c\right)=1-P\left(E\right)$

Then,

  $\begin{array}{c}P\left(E^c\right)=1-0.09\\ =0.91\end{array}$