Question: Add a column to the dataset donations _ data called Duration that contains the length of time a person has been a donor and is

Add a column to the dataset donations_data called Duration that
contains the length of time a person has been a donor and is calculated by
subtracting GiftTimeLast from GiftTimeFirst. Compute the standard deviation of
column Duration of donations_data and save you answer to an R-variable named
sd_dur.

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