A survey was conducted to obtain the number of people using the petrol station for one day. The following data was obtained: Time Number of people 6 – 8 15 8 – 10 22 10 – 12 40 12 – 14 32 14 – 16 25 16 – 18 19 Find the following: Mode 2. Median.
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.
- A survey was conducted to obtain the number of people using the petrol station for one day. The following data was obtained:
|
Time |
Number of people |
|
6 – 8 |
15 |
|
8 – 10 |
22 |
|
10 – 12 |
40 |
|
12 – 14 |
32 |
|
14 – 16 |
25 |
|
16 – 18 |
19 |
Find the following:
-
Mode
2.
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