The final grades for a fictional class have been data provided to you.

grades.csv contains information for all students in the $2$ sections the instructor is

teaching.

StudentID: A unique identifier

Section: The section number for the student $($Section $1$ or Section $2)$

Rename$1$ should be Homework

Rename$2$ should be Exam$1$

Rename$3$ should be Exam$2$

Rename $4$ should be FinalExam

Rename $5$ should be Project

Answer the following questions:

a$.$ Rename the columns in grades as described in the introduction $($Rename$1$ to

Rename$5$ ONLY$).$

b$.$ Using apply, find a measure of center and variability for each of the assignment

types.

c$.$ Using apply, find the average final grade for each student. Save this final grade

as a Final. Grade in the data frame.

If you cannot get the apply function to work above, here are the values for

Final.Grade:

$>$ grades $ Final.Grade

$[1]83\mathrm{.}2,79\mathrm{.}085\mathrm{.}880\mathrm{.}6,90\mathrm{.}478\mathrm{.}488\mathrm{.}886\mathrm{.}682\mathrm{.}083\mathrm{.}280\mathrm{.}287\mathrm{.}8,87\mathrm{.}2$

$[27]86\mathrm{.}487\mathrm{.}283\mathrm{.}683\mathrm{.}081\mathrm{.}6,84\mathrm{.}087\mathrm{.}285\mathrm{.}486\mathrm{.}4$

Add these values to your data frame directly using cbind or $$.$ Use these

values to answer the rest of the assignment. You will lose points for this

question but not for subsequent questions.