A Random Sample of Ten Examination Papers in a Course

A random sample of ten examination papers in a course that was given on a pass or fail basis showed the following scores.
$\begin{array}{cc}\text { Paper Number }&\text { Grade }&\text { Status }\\1 & 65 & \text { Pass } \\2 & 87 & \text { Pass } \\3 & 92 & \text { Pass } \\4 & 35 & \text { Fail } \\5 & 79 & \text { Pass } \\6 & 100 & \text { Pass } \\7 & 48 & \text { Fail } \\8 & 74 & \text { Pass } \\9 & 79 & \text { Pass } \\10 & 91 & \text { Pase }\end{array}$
a. What is the point estimate for the mean of the population?
b. What is the point estimate for the standard deviation of the population?
c. What is the point estimate for the proportion of all students who passed the course?