Suppose that the value of a stock varies each day from $15 to $22 with a uniform distribution. (a) Find the probability that the value of the stock is more than $19. (Round your answer to four decimal places.) (b) Find the probability that the value of the stock is between $19 and $21. (Round your answer to four decimal places.) (c) Find the upper quartile; 25% of all days the stock is above what value? (Enter your answer to the nearest cent.) $ Draw the graph. WebAssign Plot WebAssign Plot WebAssign Plot WebAssign Plot (d) Given that the stock is greater than $18, find the probability that the stock is more than $20. (Round your answer to four decimal places.)