Link: write one sine and one cosine equation for each graph below. the numbers on the x-axis are -2π, -π, π and 2π.the

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”?