What is the median of the data set? 38, 65, 72, 67, 80
A
67
B 64
C
72
D 65

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?