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Approximate the sample statistics given the following frequency distribution.
Hint: Use calculator to calculate mean, standard deviation.
Class Frequency
0 - 19 10
20 - 39 10
40 - 59 12
60 - 79 19
80 - 99 15
a) Find class midpoints. List your midpoints on ascending order, use commas to separate the midpoints.
Midpoints are:
b) Approximate the sample mean. Round the sample mean to 4 decimal places.
x¯ =
c) Approximate the sample standard deviation. Round the sample standard deviation to 4 decimal places.
s =
d) Approximate the sample variance. Round the sample variance to 4 decimal places.
s² =
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There is a "right" answer to this question, so think carefully and review your text and notes if necessary.
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