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 expected number of C's?
Definitions:
Thomas Jefferson
An American Founding Father, the principal author of the Declaration of Independence, and the third President of the United States, serving from 1801 to 1809.
John Jay
An American statesman, Patriot, diplomat, Founding Father, signatory of the Treaty of Paris, and first Chief Justice of the United States.
Constitutional Convention
A formal meeting called for the purpose of creating or revising a constitution.
Slavery
A system in which individuals are owned by others, deprived of personal freedom, and compelled to perform labor or services.
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