exam Maths Puzzle Numerical Ability

please help me in this problem
let f(X)=x/15,x=1,2,3,4,5 zero elsewhere be the pdf of a random variable , find the distribution function f(x) of x and sketch its graph along with that of f(x)

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exam Other Question

Can you please help me?

10. (3 pts) Use De Morgan�s Laws to determine whether the two statements are equivalent
NOT (p AND q), NOT (q Or NOTp)

you understand what im saying right? Can you plese help me with the following?

I need to solve and graph the following equation and interpet the result:

2x-3y=6 and 2x+y=-10.