For the Table Shown Below, the Random Variable X Is

Essay

For the table shown below, the random variable x is the number of males with tinnitus (ringing ears)among four randomly selected males, based on a medical journal. Find the mean and standard deviation for the random variable x. Use the range rule of thumb to identify the range of values that are not significant for the number of males with tinnitus among four randomly selected males. Is getting three males with tinnitus among four randomly selected males a significantly high number?
$\begin{array} { c | c } \boldsymbol { x } & \boldsymbol { P } ( \boldsymbol { x } ) \\\hline 0 & 0.674 \\1 & 0.280 \\2 & 0.044 \\3 & 0.003 \\4 & 0 +\end{array}$