please use the MATLAB for both questions THANK YOU

2. MATLAB (a) Plot the probability density function of Chi-Square (Central) random variable for the degrees of freedom 2,4,6. (b) Find the mean and variance in each case (c) For the case of degrees of freedom equals to 2, what is the probability that the random variable takes values between (-4,4]? (d) What is the right-tail probability when x=4 in each case? 3. Generate 100,000 samples of zero-mean unit variance Gaussian white noise using MATLAB. (a) Plot a segment of it (50 samples) (b) Plot Histograms and the exact probability density function (C) Comment on their differences and similarities