Forty randomly selected students were asked the number of pairs of sneakers they owned. Let X = the number of pairs of sneakers owned. The results are as follows: X Frequency Relative Frequency Cumulative Relative Frequency 1 2 2 4 3 8 4 12 5 12 6 2 Find the sample mean x. (Round your answer to two decimal places.)
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.
| X | Frequency | Relative Frequency | Cumulative Relative Frequency |
|---|---|---|---|
| 1 | 2 | ||
| 2 | 4 | ||
| 3 | 8 | ||
| 4 | 12 | ||
| 5 | 12 | ||
| 6 | 2 |
Find the sample mean x. (Round your answer to two decimal places.)
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