Allyson Felix ran the fastest time of the year for the women's 400 meter dash.

Make a quick prediction: What was her time (in seconds)?

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?