The number of tourist visiting a certain city is decreasing by 10% each year as described by the function below F(1) = 120,000
F(n + 1) = 0.9f (n)

What will be the value of f(5)?

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?