feacture vector in two classes

Hi everyone, i'm new in matlab and just found an exersice in internet and have problem to do it, can you plz help me. tanx.

Create 2 classes with guassian random data, one class has 100 data, the other one has 150 data, for each class consider difference mean vector with 2 features, and at the end plot it with desired covarrience for them.

A=randn(1,100);

B=randn(1,150);