As discussed in the class, the built$-$in MATLAB function randi can be used to generate an array of

random integers with a specified range. For this question, create a vector $$vec$$ that stores $20$ random

integers generated by the randi function, each in the range from $-20$ to $50.$ Then do each of the following

tasks with only a SINGLE MATLAB statement: $($Note: any conditional statements $($if$-$else statement, for

and while loops$)$ are NOT allowed to use in this question.$).$

a$.$ Create a variable $$new$\_$vec$$ that stores all of the numbers that are multiplies of $4$ from the vector

$$vec$.($Hint: Consider the property of division and use $$help elfun$$ to look for the proper

instruction$)$

b$.$ Create a new array that contains only the positive integers from a$)$

c$.$ Calculate the average in the array created in a$)$ without using the $$mean$$ function