15) Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below. Test A | 48 | 52 | 58 | 44 | 43 | 43 | 40 | 51 | 59 Test B 73 67 73 59 58 56 58 64 74 A) 0.867 B) 0.109 C) 0.548 D) 0.714