The following frequency table summarizes the ages of 60 shoppers at the local grocery store. 
The sample mean for the above frequency table is calculated as 36.25. Calculate the approximate sample standard deviation for this data set.
Definitions:
Dividend Growth Rate
The pace at which a business boosts the dividends it distributes to its investors over a period.
Required Return
This is the minimum profit that an investor expects to make on an investment, reflecting the level of risk involved.
Constant Growth
A model assuming that the value of an investment grows at a steady, unchanging rate indefinitely.
Constant Rate
A fixed value, often used in calculations involving growth or decay, where the rate does not change over time.
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