A sample of 47 executives in the oil industry were selected to answer a questionnaire. One question about environmental issues required a yes-or-no answer.

A.Which of the following are possible events?(You may select more than one answer. Single click the box with the question mark to produce a check mark for correct answers and double click the box with the question mark to empty the box for wrong answers.)

• 39 people respond "Yes."

• 27 people respond "Yes."

• 47 people respond "No."

• 53 people respond "No."

• The questionnaire fails to reach one executive.