Recently, a store manager tracked the time customers spent in the store from the time they took a number until they left. A sample of 12 customers was selected and the following data was recorded; where the frequency is the number of customers and value is the time spent in the store. Frequency Value 6 8 1 5 3 12 2 16 Compute the mean time spent in the store. (Round to the nearest 2 decimal places, if needed.)
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.
Recently, a store manager tracked the time customers spent in the store from the time they took a number until they left. A sample of 12 customers was selected and the following data was recorded; where the frequency is the number of customers and value is the time spent in the store.
| Frequency | Value |
| 6 | 8 |
| 1 | 5 |
| 3 | 12 |
| 2 | 16 |
Compute the mean time spent in the store. (Round to the nearest 2 decimal places, if needed.)
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