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Great job computing the variance! The last statistic will be much simpler: standard deviation.
The standard deviation is the square root of the variance. You can calculate the square root by raising the number to the one-half power.
Instructions
1.
Define a function, grades_std_deviation, that takes one argument called variance.
return the result of variance ** 0.5
After the function, create a new variable called variance and store the result of calling grades_variance(grades).
Finally print the result of calling grades_std_deviation(variance).
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