A student is performing a radioactivity experiment to determine the background radiation level in a laboratory. Over ten consecutive 10-second intervals, they record the following counts of beta particles using a Geiger-Müller tube:
18,12,15,21,14,19,11,17,24,13 18, \quad 12, \quad 15, \quad 21, \quad 14, \quad 19, \quad 11, \quad 17, \quad 24, \quad 13 18,12,15,21,14,19,11,17,24,13What is the median count for these measurements?
14.514.514.5
16.016.016.0
16.416.416.4
16.516.516.5