STAT 351 Midterm: STAT351_-Study_Notes_2007.old

Programming section (30 points total) The following code must all go inside of a class called Midterm. 21. Write a method sum which takes as input an array of int and returns the sum of the elements in the array. For example, if the array contains 10 2 3, your method should return 15.

3. Suppose that P and Q are 4 x 4 matrices, that R = adj(P2) and that det P = -2, det Q = 3. Then the determinant of -3R? PQ-4 is A)48 B)-128 C) -18 D)128 E)None of the above

14. What value is returned by the following method if the input array is {2,3,4, 1, 2, 1} public static int mystery (int[] array) { int foo = 1; for (int i = 0; i < array.length; i++) { foo = foo * array[i]; return foo; (A) 48 (B) 2 (C) 24 (D) 16 (E) 4