The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes with the results shown in the table below. Arrivals Frequency 0 22 1 47 2 39 3 33 4 24 5 19 6 10 7 5 8 1 a. Compute the mean number of arrivals per minute.
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.
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes with the results shown in the table below.
| Arrivals | Frequency |
| 0 | 22 |
| 1 | 47 |
| 2 | 39 |
| 3 | 33 |
| 4 | 24 |
| 5 | 19 |
| 6 | 10 |
| 7 | 5 |
| 8 | 1 |
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