(a) Find the sample mean. (Round to two decimal places as needed.)
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 grade point averages (GPA) for 12 randomly selected college students are shown below. Complete parts (a) through (c).
Assume the population is normally distributed.
GPAs: 2.2, 3.3, 2.7, 1.6, 0.8, 4.0, 2.2, 1.4, 3.6, 0.4, 2.4, 3.1
(a) Find the sample mean.
\[ \bar{x} = \] (Round to two decimal places as needed.)
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