An instructor grades exams, 30%; term paper, 20%; and final exam, 50%. A student had grades of 87, 72, and 95, respectively, for exams, term paper, and final exam. Find the student's final average. Use the weighted mean. Use a graphing calculator.
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.
An instructor grades exams, 30%; term paper, 20%; and final exam, 50%. A student had grades of 87, 72, and 95, respectively, for exams, term paper, and final exam. Find the student's final average. Use the weighted
Formula Used:
Arithmetic mean =
Weighted Mean W =
Where, n = number of observations
w = weights applied to the values
X = values
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