Find mean & standard deviation using table: X Frequency 2 20% 5 10% 8 15% 10 30% 12 25% For the mean, i get 7.4 & 20%. Std dev i get 4.459362. Just wanted to check my numbers.
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.
Find mean & standard deviation using table:
| X | Frequency |
| 2 | 20% |
| 5 | 10% |
| 8 | 15% |
| 10 | 30% |
| 12 | 25% |
For the mean, i get 7.4 & 20%. Std dev i get 4.459362. Just wanted to check my numbers.
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