Find the Number of Standard Deviations from the Mean

question 209

Multiple Choice

Find the number of standard deviations from the mean. Round your answer to two decimal places.
-Mario's weekly poker winnings have a mean of $353 and a standard deviation of $67. Last week he won $185. How many standard deviations from the mean is that?

• A) 1.25 standard deviations below the mean
• B) 1.25 standard deviations above the mean
• C) 2.51 standard deviations below the mean
• D) 2.51 standard deviations above the mean

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Definitions:

Beta Waves

The brain wave pattern associated with mental activity.

Alpha Waves

Brain waves detected via EEG that are associated with relaxed, wakeful states, typically present during meditation and light sleep.

Theta Waves

Brainwave patterns associated with stages of sleep and deep meditation, reflecting a state of relaxation.

Delta Waves

Slow brain waves that are present in deep sleep and represent the deepest stage of dreamless sleep.