We are using a private branch exchange (PBX), a telephone switch, to connect our office building to the telephone company's central office. There are 50 telephones in the building, and each telephone is used on average 5% of the workday to make calls to/from phones outside the building. The PBX enables us to connect telephones inside the building without having to use the services of the telephone company. Telephone calls to/from phones outside the building are connected by the central office. We want to determine the required capacity of the line between the PBX and the telephone company's central office, expressed as a multiple N of the bandwidth required for each phone call. Required:
Calculate the probability that a call will be blocked due to not enough capacity between the PBX and the central office.

d i think

step-by-step explanation:

where are the graphs?

step-by-step explanation:

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.