use matlab

Consider the below vector x, which you can copy and paste directly into Matlab. The vector contains the final (a) what proportion of students falled the course (1.e., got a mark of less than 50 ): (Note that since the answer is a proportion, it must be between 0 and 1.) (b) What proportion of students got a B-, B, or B+ (i.e., got a mark between 70 and 79 , inclusive)