A total of 2000 college and university students responded to a provincial survey concerning the number of paid hours they worked during the week while registered in classes. Of particular interest was the number of students who held at least two part-time jobs at the same time while attending school. The results follow:

Number of Jobs	Number of Students Responding Yes
1	925
2	600
2+	150

 

a. Estimate the value of the population proportion of the number of students who held at least two part time jobs while attending school.
b. Estimate the value of the standard error of proportions for part (a).
c. What is the probability that the number of students holding at least two part-time jobs while attending school is between 700 and 725 students.