USING MATLAB AND NEED CODES

3) Create a user defined function to calculate standard deviation of the values in vector x. Name the function as: Fstd. Test your Fstd function by creating an x vector in command window and then write Fstd(x) The squared value of standard deviation ? is calculated from the following formula istd) The squared value 2??1 In the above formula ? is mean (average value) of the elements of the vector X. Nis the number of elements in x. Formula of u is given below: k-1 where yr. -r. +x, +..+x