Carlos is a very hard-working student who studies every night for at least one hour. His favorite subject is mathematics. He knows that his grade for each marking period is determined by a weight of 50% for all daily work and 50% for major grades, such as, tests, projects and quizzes. He received the following test grades for mathematics during the fourth marking period: 89, 78, 90, 81, 95, and 90. What was his mean mathematics test grade rounded to the nearest whole number? O 90 O 87 O 77 O 93
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.
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