Value 150 300 450 600 Cumulative %0 |19.3 37.6 |62.7 77.5 Value 750 900 1050 1200 | 1350 Cumulative % 87.2 |93.8 95.7 |98.6 99.1 Value 1500 1650 1800 1950 Cumulative % 99.5 99.6 99.8 100.0
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.
Fire load (MJ/m2) is the heat energy that could be released per square meter of floor area by combustion of contents and the structure itself. The article “Fire Loads In Office Buildings” (J. of Structural Enter., 1997: 365-368) gave the following cumulative percentages (read from a graph) for lire loads in a sample of 388 rooms:
a. Construct a relative frequency histogram and comment on interesting features.
b. What proportion of fire loads are less than 600? At least 1200?
c. What proportion of the loads are between 600 and 1200?
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