The following table shows the frequency distribution of scores on a math test. Scores Frequency 50 to 59 2 60 to 69 4 70 to 79 6 80 to 89 15 90 to 99 5 What is the class width? it can not be determined 9 10 correct answer is not given
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 following table shows the frequency distribution of scores on a math test.
| Scores | Frequency |
| 50 to 59 | 2 |
| 60 to 69 | 4 |
| 70 to 79 | 6 |
| 80 to 89 | 15 |
| 90 to 99 | 5 |
What is the class width?
- it can not be determined
- 9
- 10
- correct answer is not given
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