The cumulative frequency table below shows the marks carned by 1400 students in Mathematics and English 1500 1400 1300 1200 1100 English/ Mathematics 1000 900 800 700 600 500 400 300 200 100 50 60 70 80 90 100 10 20 30 Marks Cumulative frequency 40
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.
1. How many students got more than 40 marks in mathematics?
2. How many students got between 60 and 70 marks in English?
3. Use suitable data from these graphs, use the median and
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