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A recent survey of Fortune 500 firms found that on average, they contribute $332.54 per month for each salaried

employee's health insurance. If you are told that virtually all salaried employees at Fortune 500 firms receive a health insurance contribution between $220.61 and $444.47, and assuming a bell-shaped distribution, what must the standard deviation for this data be?

A) $37.31

B) $46.65

C) $55.98

D) $74.64

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