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//Example 12.2
//Page 526
disp('The average number of arrivals in a 30 sec interval is,')
lamt=4*(30/60)
disp('The probability of eight or more arrivals is,')
P0=1
P1=[(2^1)/(1)]
P2=[(2^2)/(1*2)]
P3=[(2^3)/(1*2*3)]
P4=[(2^4)/(1*2*3*4)]
P5=[(2^5)/(1*2*3*4*5)]
P6=[(2^6)/(1*2*3*4*5*6)]
P7=[(2^7)/(1*2*3*4*5*6*7)]
i=1-{(%e^-2)*[P0+P1+P2+P3+P4+P5+P6+P7]}
disp("Result")
disp("P(2) = 0.0011")
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