A Student Asked a Statistics Professor If Grades Were Marked

Multiple Choice

A student asked a statistics professor if grades were marked "on the curve." The professor decided
To give the student a project to determine if last year's statistics grades were normally distributed.
The professor told the student that last year's mean mark was 70 with a standard deviation of 10
And to use the following results.
What is the critical value of chi-square at the 0.05 level?

A) 12.833
B) 11.070
C) 12.592
D) 14.449
E) 19.675