Exam Scores An instructor gives a 100 -point examination in which the grades are normally distributed. The mean is 60 and the standard deviation is 7 . If there are 5% A 's and 5% F 's, 15% B 's and 15% D 's, and 60% C 's, find the scores that divide the distribution into those categories. Round the cutoff scores to the nearest whole number. Round intermediate z -value calculations to 2 decimal places. A: __- __B: __-__ C: __-__ D: __-__ F:__ -___
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.
Exam Scores An instructor gives a 100 -point examination in which the grades are
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