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Assume the time to complete a task has a normal distribution with mean 20 min. and...

Assume the time to complete a task has a normal distribution with mean 20 min. and standard deviation 4 min.

Find the proportion of times that are BETWEEN 15 and 25 minutes?

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

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Assume the time to complete a task has a normal distribution with mean 20 min. and standard deviation 4 min.

Find the proportion of times that are ABOVE 22 minutes?

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

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Assume the time to complete a task has a normal distribution with mean 20 min. and standard deviation 4 min.

Find the cutoff for the FIRST Quartile.

Note: Enter X INTEGER and round up. Thus, 7 is entered as 7, 3.5 is entered as 4, 0.3750 is entered as 0

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Assume the time to complete a task has a normal distribution with mean 20 min. and standard deviation 4 min.

Find the cutoff for the SECOND Quartile.

Note: Enter X INTEGER and round up. Thus, 7 is entered as 7, 3.5 is entered as 4, 0.3750 is entered as 0

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Assume the time to complete a task has a normal distribution with mean 20 min. and standard deviation 4 min.

Suppose a sample of 25 tasks is collected. What is the standard deviation of the resulting sample mean??

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

math   Statistics-And-Probability   
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