Question: Add a type signature for your function to your source file. To test it, load the source file into ghci again. Write a function that

Add a type signature for your function to your source file. To test it, load the source file into ghci again. Write a function that computes the mean of a list, i.e., the sum of all elements in the list divided by its length. (You may need to use the from Integral function to convert the length of the list from an integer into a floating-point number.)

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