$($a$)$ Develop a user defined function $$MyVar$$ that calculates a variance by using the following

equation: $=(3$

$2)$

$$

$=1$

$21$

where Avg represents the average of variableiX $.$ Use the values given on the sheet $$P$3$a$$ to test

the function. Remember that this function must have three arguments $($X$,$ Avg, and n$).$

$($b$)$ Develop a user defined functio