Find the Number of Standard Deviations from the Mean

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 $323 and a standard deviation of $50. Last week he won $177. How many standard deviations from the mean is that?

A) 1.46 standard deviations above the mean
B) 2.92 standard deviations above the mean
C) 1.46 standard deviations below the mean
D) 2.92 standard deviations below the mean