Answer:
115
Step-by-step explanation:
41 no costume, 78 exactly one costume, 10 more than one costume.
41+78+\color{steelblue}{10}=
41+78+10=
\,\,\color{indianred}{129}
129
There were a toal of 129 visitors. 10 purchased more than one costume.
Probability the next customer will purchase more than one costume:
\frac{\color{steelblue}{10}}{\color{indianred}{129}}\phantom{=}
129
10
=
\,\,
Out of 2000 new trials, we would expect more than one costume to be selected:
\color{purple}{2000}\times\frac{\color{steelblue}{\color{steelblue}{10}}}{\color{indianred}{\color{indianred}{129}}}=
2000×
129
10
=
\,\,155.038759...
155.038759...
\approx
≈
\,\,155
155
