The Houston Zoo has 3 elephants weighing in at 610 0 kg, 470 kg and 450 kg. What is the average weight of an elephant from the Houston Zoo ?

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?