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Descriptive statistics for business students

I need the simplest step by step directions for the following word problem.
Management of a grocery store recorded the number of coupons redeemed by customers during a recent double coupon sale. The data is presented below.

# of coupons f
0-4 15
5-9 9
10-14 6
15-19 8
20-24 4

Find the Mean
Mode
Median
82nd percentile
Variance
Standard Deviation

Solution Preview

Number of coupons Frequency Cumulative freq Mid-point Total Relative Relative cumulative
frequency frequency

0-4 15 15 2 30 0.357 0.357

5-9 9 24 7 63 0.214 0.571

10-14 6 30 12 72 0.143 0.714

15-19 8 38 17 136 0.190 0.904

20-34 ...

Solution Summary

Step by step calculations for descriptive statistics of a data set. Data is represented by a frequency table. Mean, mode, median, 82nd percentile, variance and standard deviation calculations are included.

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