A student has completed 20 courses in the School of Arts and Sciences. Her grades in the 20 courses are shown below. 
a.Develop a frequency distribution and a bar chart for her grades.
b.Develop a relative frequency distribution for her grades and construct a pie chart.
Definitions:
T-test
A technique in statistics for comparing the means of two groups to see if they differ in a statistically significant way.
Alpha
Often referred to as the level of significance in hypothesis testing, it represents the threshold at which the null hypothesis is rejected.
T-test
A statistical test used to compare the mean of two groups to see if there is a significant difference between them.
Null Hypothesis
The hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.
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