The average electricity bill for Lynn's home is $64.50 per month with a standard deviation of $8.20. In June she received a bill of only $30.00 because she was traveling for most of the month. How many standard deviations below the mean is the amount of Lynn's electricity bill for June?
A.) 2.00
B.) 3.65
C.) 4.20
D.) 7.86
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