Mark for Review Every year a student is chosen at random to win a prize. The first part of this selection involves choosing which class will be selected. You are asked to write the code to select a student, from grades 9-12, inclusive, and you are to assume there is an equal probability for each to occur. The following incomplete statement appears in a program that computes the value of the random number chosen. int year = /* missing code */; Which of the following replacements for /* missing code */ would best simulate the selection of a grade from 9-12? (int)(Math.random() * 13) Ⓑ (int)(Math.random()*9)+4 (int)(Math.random() * 4) +9 (int)(Math.random()*419 A B Undo

4 Mark for Review Assume that the following variable declarations have been made. double d = Math.random(); double r; Which of the following assigns a value to r from the uniform distribution over the range 0.5 ≤r < 5.5 ? B r = d + 0.5; (C) r = d + 0.5 * 5.0; D r = d 5.0%; r = d 5.0+ 0.5; B

Which of the following statements assigns a random integer between 25 and 60, inclusive, to rn? int rn= (int) (Math.random() * 25) + 36%;B B int rn = (int) (Math.random() * 25) + 60; int rn= (int) (Math.random() * 36) + 25; int rn= (int) (Math.random() * 60) + 25;