Mean, median, mode, standard deviation, frequency distributions

Extracted Content from Question Files:

The following data shows the grades of a sample of 15 students on a history test:

63 78 57 53
96 48 59 67
44 85 65 74
55 51 69

A) Using the raw data, compute the mean grade.
B) Using the raw data, determine the median grade.
C) By comparing the mean and the median, what type of skew is reflected in the
data?
D) Using the raw data, compute the Standard Deviation of the grades.
E) Construct a Frequency Distribution of the grades. Use a class interval of 10, and
the value 40 as the lower limit of the first class. (Show the class limits,
boundaries, midpoints, frequencies, and cumulative more-than frequencies in the
frequency distribution).