Given below are the sodium contents (in mg) for seven brands of hot dogs rated as "very good." 410    480    340    350    260    540    520   (b) Use the given data to produce a point estimate of ?2, the variance of sodium content for hot dogs. (Round your answer to four decimal places.) ?2 =  (c) Use the given data to produce an estimate of ?, the standard deviation of sodium content. (Round your answer to four decimal places.) ? =

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