Question
The mean value of the seven bills in a man's wallet is $20 and the standard...
The mean value of the seven bills in a man's wallet is $20 and the standard deviation is $14.14. The man removes two $20 bills from his wallet. What is the standard deviation of the values of the five remaining bills in his wallet?
A) $13.57
B) $14.14
C) $15.81
D) $16.73
E) $17.32
Answer is E) but I have no idea how to do this, what are the steps to calculating this?
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