A physical parameter x is a function of time t, which is defined as
x(t) = sin 5t +cos 11t.
(1), For t = 0 to 8?, take discrete sample data of the function x(t) with time interval of 0.025 sec, thus forming a dataset {x}.
(2), Calculate the mean value and standard deviation of {x}.
(3), Develop a Matlab code to generate plots of (a), the histogram, and (b), the probability density function for the data set {x}, respectively.