Phone calls: The lengths of calls (in minutes) made by a salesperson in one week. Find the mean of the grouped data below. Lenght of Calls Number of calls 1-5 12 6-10 26 11-15 20 16-20 7 21-25 11 26-30 7 31-35 4 36-40 4 41-45 1
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.
Phone calls: The lengths of calls (in minutes) made by a salesperson in one week.
Find the mean of the grouped data below.
Lenght of Calls Number of calls
1-5 12
6-10 26
11-15 20
16-20 7
21-25 11
26-30 7
31-35 4
36-40 4
41-45 1
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