The life expectancy of a fluorescent light bulb is given by the number of hours that it will burn. Complete the following table. Life of bulb Midpoint Frequency f Product (hours) xf -0.5-499.5 499.5-999.5 11 999.5-1,499.5 13 1,499.5-1,999.5 17 1,999.5-2,499.5 27 2,499.5-2,999.5 33 2,999.5-3,499.5 14 3,499.5-3,999.5 From the frequency distribution, find the mean life of this type of bulb (in h). (Round your answer to one decimal place.) mean =
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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