Find the Number of Standard Deviations from the Mean

question 160

Multiple Choice

Find the number of standard deviations from the mean. Round your answer to two decimal places.
-The annual snowfall in a town has a mean of 39 inches and a standard deviation of 10 inches. Last year there were 64 inches of snow. How many standard deviations from the mean is that?

• A) 0.45 standard deviations above the mean
• B) 0.45 standard deviations below the mean
• C) 2.50 standard deviations above the mean
• D) 2.50 standard deviations below the mean

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Definitions:

P-Charts

Control charts used for monitoring the proportion of defective items in a process over time.

Statistical Process Control (SPC)

A method of quality control which employs statistical methods to monitor and control a process, helping to ensure that it operates at its fullest potential.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values, calculated as the square root of the variance.

Process Control Limits

Boundaries in a control chart within which a process operates normally, and outside of which the process may need correction.