The city of Madison regularly checks the quality of water at swimming beaches located on area...

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The city of Madison regularly checks the quality of water at swimming beaches located on area...

The city of Madison regularly checks the quality of water at swimming beaches located on area lakes. Fifteen times the concentration of fecal coliforms, in number of colony forming units (CFU) per 100ml of water, was measured during the summer at one beach. 180 1600 90 140 50 260 400 90 380 110 10 60 20 340 80. What is the sample standard deviation?

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