Question

An event having only one outcome is called an elementary event. The sum of the probabilities of all the elementary events of an experiment is _____.

• A. $0$
• B. $0.5$
• C. $1$
• D. None of the above

Answer 1

Answer: (C)

$1$

$The$ $total$ $of$ $all$ $the$ $possibilities$ $must$ $add$ $up$ $to$ $1.$
$It$ $is$ $equivalent$ $to$ $say$ $that$ $out$ $of$ $all$ $the$ $possibilities,$ $one$ $of$ $them$ $has$ $to$ $surely$ $happen.$