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:

Brainstem

The structure that connects the cerebrum with the spinal cord and controls vital functions such as breathing, heart rate, and blood pressure.

Basal Ganglia

Groups of neurons located deep in the brain that help to control movement, as well as aspects of cognition and emotion.

Motor Control

The processes that regulate the movement and coordination of muscles and limbs.

Cerebellum

A major structure of the hindbrain that is responsible for motor control, coordination, precision, and accurate timing of movements.