The following is the distribution of the percentage of students belonging to a certain minority group in 40 schools: Percentage Frequency 0- 4 14 5- 9 11 10-14 7 15-19 6 20-24 2 a. Calculate the mean. b. Calculate the mode. c. Calculate the median. d. Calculate s2 for this distribution (i) without coding; (ii) with coding. e. Calculate C.V. f. Calculate Sk.
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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