Classes. Describe the shapee The ages of dishwashers (in years) in 20 randomly selected households are shown bel 12 9. 9. 11 1 7 8 8. 6. 13 15 7 6 8. 8. 2 1 A. bell shaped B. skewed to the right O c. skewed to the left O D. uniform
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 frequency distribution is given as under:
| Bin | Frequency |
| 1-4 | 4 |
| 4-7 | 5 |
| 7-10 | 7 |
| 10-13 | 3 |
| 13-16 | 1 |
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