An average of 100 customers per hour arrive at GothamCity Bank. It takes a teller an average of 2 minutes to servea customer. Interarrival and service times are exponential.The bank currently has four tellers working. The bankmanager wants to compare the following two systems withregard to average number of customers present in the bankand the probability that a customer will spend more than 8minutes in the bank:System 1 Each teller has her own line, and no jockeyingbetween lines is permitted.System 2 All customers wait in a single line for the firstavailable teller.If you were the bank manager, which system would youprefer?
Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
An average of 100 customers per hour arrive at Gotham
City Bank. It takes a teller an average of 2 minutes to serve
a customer. Interarrival and service times are exponential.
The bank currently has four tellers working. The bank
manager wants to compare the following two systems with
regard to average number of customers present in the bank
and the probability that a customer will spend more than 8
minutes in the bank:
System 1 Each teller has her own line, and no jockeying
between lines is permitted.
System 2 All customers wait in a single line for the first
available teller.
If you were the bank manager, which system would you
prefer?
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