A project consists of six consecutive tasks that have average duration and worst-case duration estimates (in days) as shown in the table. Use Newbold's method to determine the aggregated two sigma buffer for this project. 
Definitions:
Lithium
A medication commonly used to treat and prevent manic episodes in people with bipolar disorder.
Suicidality
The risk or tendency toward having suicidal thoughts, making suicidal plans, or attempting suicide.
Toxic Dose
The amount of a substance that causes harmful effects to an organism, potentially leading to poisoning or death.
Cyclothymic Disorder
Milder but more chronic form of bipolar disorder that consists of alternation between hypomanic episodes and mild depressive episodes over a period of at least 2 years.
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