u can chek the hardness by pH scale...lolz
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in order to calculate the mean of the sample's mean and also to calculate the standard deviation of the sample's
We would need to know what sample you are referring to in order to answer this question.
Count up the number of obseravtions made on the experimental units. That is the sample size.
Density of a substance = (mass of a sample of the substance) divided by (volume of the same sample)
i dont no the answer