Calculating historical standard deviation

This text file has Appleā€™s stock price from December 12, 1980 until April 2, 2015. Calculate the standard deviation of the adjusted close price (the last column in the CSV file) over the entire data set. This page explains how to calculate the standard deviation.

Use the variance to come up with the standard deviation, not the sample variance. In other words, when calculating the variance, divide by n, not (n - 1).

Round your answer to the nearest single decimal point.