Anaiya ordered a set of brown and purple pins. She received 80 pins, and 80% of them were brown. How many brown pins did Anaiya receive?

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?