The test scores of 15 students are listed below. find the lower quartile (q1). 42 45 50 57 60 63 66 70 73 78 85 87 90 94 95

From the test scores given:

42 45 50 57 60 63 66 70 73 78 85 87 90 94 95

splitting the values into 3 sets:

(42 45 50 57 60) (63 66 70 73 78) (85 87 90 94 95)

from the first set we select the median:

42 45 50 57 60

the median is 50

thus the first quartile will be 50