A phone solicitation firm kept statistics on the lengths of the phone calls made to their clients. The results are shown below: Time(min) 1 2 3 4 5 6 7 Frequency 10 11 24 16 40 10 8 Determine the expected length of a phone call. answer as a decimal rounded to 2 decimal places.
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 phone solicitation firm kept statistics on the lengths of the phone calls made to their clients. The results are shown below:
| Time(min) | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Frequency | 10 | 11 | 24 | 16 | 40 | 10 | 8 |
Determine the expected length of a phone call. answer as a decimal rounded to 2 decimal places.
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