A Simple Random Sample of 6 Recent Graduates Revealed the Following

Short Answer

A simple random sample of 6 recent graduates revealed the following information about their weekly incomes.
$\begin{array}{lr}\text { Graduates }&\text { Weekly Income }\\\mathrm{A} & \$ 250 \\\mathrm{~B} & 270 \\\mathrm{C} & 285 \\\mathrm{D} & 240 \\\mathrm{E} & 255 \\\mathrm{~F} & 290\end{array}$
a. What is the expected value of the average weekly income of all the recent graduates?
b. What is the expected value of the standard deviation for the population?