The grades for 30 students on the most recent exam are given in the data table below: Round your answer to 2 decimal places as needed 60 80 70 70 80 90 80 70 80 80 60 70 70 70 70 90 70 70 80 90 60 90 70 60 90 70 90 90 90 80 What is the mean score for the exam? What is the median score for the exam? Vhat is the standard deviation for the exam?
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.
Given data,
| 60 | 80 | 70 | 70 | 80 | ||
| 90 | 80 | 70 | 80 | 80 | ||
| 60 | 70 | 70 | 70 | 70 | ||
| 90 | 70 | 70 | 80 | 90 | ||
| 60 | 90 | 70 | 60 | 90 | ||
| 70 | 90 | 90 | 90 | 80 |
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