The Maths GCSE test scores of 280 students are shown in the histogram below. 54 4- 2- 80 90 100 110 120 130 140 150 160 170 180 190 200 Score a) Find the median score. b) Find the lower quartile of the scores. Frequency density
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.
The maths score of 280 students has be represented in a histogram ,we have to calculate the median and the lower quartile scores.
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