There are 25 trees on the Jackson's property. Twenty percent of the trees are oak trees. Which equation can be used to find the number of oak trees on the property?
25-1 25
O 20-120
100 x 5 500
20x5 100
O
20x4 80
25 x 100
20-4 5
100-4

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?