A local Choice Bank branch has 3 tellers who serve customers. On average, 5 customers arrive at the bank each hour with the standard deviation of the customers’ inter-arrival times being 12 minutes. Service usually takes 28 minutes with the standard deviation of the service time being 28 minutes. Q7. What is the average number of tellers that are not serving anybody? Group of answer choices 2.33 bankers 2.71 bankers 0.83 bankers 1.43 bankers 0.67 bankers
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
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