Use the Values in the Table to Calculate Activity Durations

question 25

Essay

Use the values in the table to calculate activity durations and variances for the project.What is the likelihood that the project takes between 60 and 55 days to complete?
$\begin{array}{|l|l|l|l|}\hline \text { Activity } & \text { Activity time } & \begin{array}{l}\text { Standard } \\\text { deviation }\end{array} & \text { Predecessor } \\\hline \mathrm{A} & 12 & 3 & \\\hline \mathrm{B} & 8 & 2 & \mathrm{~A} \\\hline \mathrm{C} & 9 & 1 & \mathrm{~A} \\\hline \mathrm{D} & 5 & 1 & \mathrm{~B} \\\hline \mathrm{E} & 12 & 0 & \mathrm{~B} \\\hline \mathrm{F} & 10 & 0 & \mathrm{C} \\\hline \mathrm{G} & 7 & 2 & \mathrm{C} \\\hline \mathrm{H} & 9 & 3 & \mathrm{E}, \mathrm{G} \\\hline \mathrm{I} & 15 & 2 & \mathrm{D}, \mathrm{G} \\\hline \mathrm{T} & 8 & 2 & \mathrm{H} \\\hline \mathrm{K} & 11 & 3 & \mathrm{I} \\\hline \mathrm{L} & 7 & 2 & \mathrm{~J}, \mathrm{~K} \\\hline\end{array}$

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Definitions:

Standard Error

The standard deviation of the sampling distribution of a statistic, typically the mean, indicating the precision of the statistic.

Magazines

Publications, usually periodical, that contain articles, stories, and advertisements.

Standard Deviation

A measure of the dispersion or spread of a set of data points relative to its mean, indicating how widely the values differ from the average.

Sample Mean

The sample mean is the average value in a sample, calculated by adding all the sample values together and dividing by the number of samples, representing the central tendency of the sample.