The manager of a band recorded the amount of time each customer spent waiting in line during peak business hours on Monday. The following is a frequency distribution table for the waiting time (in minutes). Waiting Time (in min) # of customers (f) 0-5 2 6-11 3 12-17 5 18-23 11 24-29 9 30-35 15 36-41 12 A: The class width of the frequency distribution is______ B: The midpoint of the 3rd class is____ C: The Σf is equal to___ D: The mean of the distribution is____ (Round to 1 decimal place)
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 manager of a band recorded the amount of time each customer spent waiting in line during peak business hours on Monday. The following is a frequency distribution table for the waiting time (in minutes).
| Waiting Time (in min) | # of customers (f) |
| 0-5 | 2 |
| 6-11 | 3 |
| 12-17 | 5 |
| 18-23 | 11 |
| 24-29 | 9 |
| 30-35 | 15 |
| 36-41 | 12 |
A: The class width of the frequency distribution is______
B: The midpoint of the 3rd class is____
C: The Σf is equal to___
D: The mean of the distribution is____ (Round to 1 decimal place)
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