Answer:
The probability that there are exactly 3 customers in the system is 0.1024
Explanation:
Arrival rate (λ) = 28 customers/hour
Service rate (μ) = 35 customers/hour
Proportion of busy time of the server (ρ) = λ/μ
ρ = 28/35 = 0.8
Probability that there are exactly 3 customers in the system
(P₃) = ρ³(1 - ρ)
P₃ = 0.8³(1 - 0.8)
P₃ = 0.512 × 0.2
P₃ = 0.1024
Therefore, the probability that there are exactly 3 customers in the system is 0.1024
