The linear factors of the cubic are (x-2)(x − 3)(x - 5)
the leading coefficient is
-5 = a(0 – 2) (0 - 3)(0-5
a= V 1/6
Write the function:
f(x) =

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?