Suppose f(x) is a function such that if p f(x) can be odd or even.
f(x) can be odd but cannot be even.
Of(x) can be even but cannot be odd.
f(x) cannot be odd or even.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?