Probability the average time between incoming calls at a switchboard is 3 minutes. if a call has just come in, the probability that the next call come within the next t minutes. is p(t) = 1 -e - t/3 find the probability of each situation.
(a) a call in comes within 1/2 minutes.
(b) a call in comes within 2 minutes.
(c) a call in comes within 5 minutes.

a) 0.1535

b) 0.4866

c) 0.8111

Step-by-step explanation:

The probability that the next call come within the next t minutes is:

According to this model,

a) the probability that a call in comes within 1/2 minutes is =0.1535

b) the probability that a call in comes within 2 minutes is   =0.4866

c) the probability that a call in comes within 5 minutes is   =0.8111

step-by-step explanation:

see if this :

sina-sinb

cosb+cosa

tana-tanb

cos0+cos x pi/3

20tan

step-by-step explanation: