Approximate the mean of the frequency distribution for the ages of the residents of a town. Age Frequency 0-9 31 10-19 27 20-29 14 30-39 20 40-49 22 50-59 43 60-69 46 70-79 11 80-89 7 What is the approximate mean age in years.
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.
|
Age
|
Frequency
|
|
|
0-9
|
31
|
|
|
10-19
|
27
|
|
|
20-29
|
14
|
|
|
30-39
|
20
|
|
|
40-49
|
22
|
|
|
50-59
|
43
|
|
|
60-69
|
46
|
|
|
70-79
|
11
|
|
|
80-89
|
7
|
What is the approximate mean age in years.
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