What is the probability of drawing a k, q or j from a deck of playing cards?

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Ihonestly have no clue if it's each or none.