Computing the mean value for the given data.
1.A set of N = 20 exam scores has a mean of µ = 50. The instructor discovered that one student cheated on the exam so 20 points are subtracted from that student's score. What is the new mean for the class?
a.50
b.49
c.30
d.Cannot be determined from the information given
2.A professor recorded score from a 5-point quiz for each student in an introductory psychology class. If the data are presented in a frequency distribution graph, what type of graph should be used?
a. A bar graph
b. A histogram
c. A polygon
d. Either a histogram or a polygon