The marks for Dr. Smiths?s third-year classes in zoology are given below:

Class A	71	82	55	76	66	71	90	84	95	64	71	70	73	45	73	51	68
Class B	54	80	12	61	73	69	92	81	80	61	75	74	15	44	91	63	50	84

1. Determine the three measures of central tendency.
2. Calculate the variance and standard deviation.
3. Determine the five figure summary and the interquartile range.
4. Create a box plot for each class.
5. Use the measures calculated in questions (1) ? (3) and the box-and-whisker plot from (4) to compare the performance of the two classes.
6. Comment on the effect of outliers on these numerical summaries.