question is on part D only. how do we find the two values of the area .19 and 0.81 on the left. Where did these two numbers come from? I know how to do the calculati
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 grades: Scores on a statistics final in a large class were
. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals.
(a) Find the 47th percentile of the scores.
(b) Find the 65th percentile of the scores.
(c) The instructor wants to give an A to the students whose scores were in the top 12% of the class. What is the minimum score needed to get an A?
(d) Between what two values are the middle 62% of the scores? (Enter the smaller number in the first box.)
My question is on part D only. how do we find the two values of the area .19 and 0.81 on the left. Where did these two numbers come from? I know how to do the calculation beyond this, thank you.
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