From the test scores given: <span> 42 45 50 57 60 63 66 70 73 78 85 87 90 94 95 splitting the values into 3 sets: </span><span> (42 45 50 57 60 )(63 66 70 73 78)( 85 87 90 94 95) from the first set we select the median: </span>42 45 50 57 60 the median is 50 thus the first quartile will be 50