Answer:
Okay
Step-by-step explanation:
Answer:
The value is
Step-by-step explanation:
From the question we are told that
The number of customer that enter the tellers every 5 minutes is 
Generally the probability that exactly three customers enter the queue in a randomly selected five-minute period is mathematically represented as

=> 
=>
Answer:
18.02 units
Step-by-step explanation:
perimeter of a triangle ABC
Perimeter of a Triangle
= AB + BC + CA
= 10cm + 8cm + 12cm,
(add the length of each side of the triangle).
= 30cm
Perimeter of the triangle = Sum of the sides.