If the graph of f(x)=x2 f ( x ) = x 2 , how will the graph be affected if it is changed to f(x)=3x2 f ( x ) = 3 x 2 ?

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?