The manufacturer of a popular soft drink claims that cans of this drink contain 12 ounces.  A consumer group is suspicious of this claim and believes the amount in each can is less than 12 ounces.  A random sample of 18 cans is selected and the amount in each can is measured.  The results are as follows: 11.9     11.9     12.0     11.9     12.0     11.7     11.6     11.5     11.6    12.0     11.8     11.7     12.2     11.5     12.1     11.8     12.1     11.8 Calculate the sample standard deviation s. Round its value to two decimal places.____________

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