QUESTION $15$

The mean grade in this class last semester was $78\mathrm{.}3,$ and the variance was $81.$ The distribution of grades was unimodal and symmetrical. Using this information determine the probability that "Joe", a random student you know nothing about, other than the fact that they are taking this class next semester, what is the probability that this student will receive a grade that is above $90$

QUESTION $16$

The mean grade in this class last semester was $78\mathrm{.}3,$ and the variance was $81.$ The distribution of grades was unimodal and symmetrical. Using this information determine the probability that $"$ Joe", a random student you know nothing about, other than the fact that they are taking this class next semester, what is the probability that this student will receive a grade that is between $87$ and $97$

QUESTION $17$

The mean grade in this class last semester was $78\mathrm{.}3,$ and the variance was $81.$ The distribution of grades was unimodal and symmetrical. Using this information determine the probability that "Joe". a random student you know nothing about, other than the fact that they are taking this class next semester, what is the probability that this student will receive a grade that is between $80$ and $85$

$0\mathrm{.}1968$

QUESTION $18$

The mean grade in this class last semester was $78\mathrm{.}3,$ and the variance was $81.$ The distribution of grades was unimodal and symmetrical. Using this information determine the probability that "Joe", a random student you know nothing about, other than the fact that they are taking this class next semester, What is the probability that this student will receive a grade that is lower than $60$

QUESTION $19$

The mean grade in this class last semester was $78\mathrm{.}3,$ and the variance was $49.$ The distribution of grades was unimodal and symmetrical. Using this information determine the probability that "Joe", a random student you know nothing about, other than the fact that they are taking this class next semester. what is the probability that this student will receive a grade that is lower than $60$ OR higher than $95$