The acidity or alkalinity of a solution is measured using pH. A pH less than 7 i

Question

The acidity or alkalinity of a solution is measured using pH. A pH less than 7 is acidic; a pH greater than 7 is alkaline. The accompanying data represent the pH in samples of bottled water and tap water. Complete parts (a) and (b).

Tap 7.64 7.45 7.477.47 7.507.50 7.68 7.817.81 7.45 7.227.22 7.56 7.477.47 7.52 7.477.47 Bottled 5.15 5.09 5.355.35 5.20 4.904.90 5.23 5.525.52 5.355.35 5.13 5.355.35 5.225.22 5.24

A. For tap water, the mean pH is ---(Round to three decimal places as needed.) B. The mean does not exist.

Explanation / Answer

A) For tap water, the mean pH = Sum of observation / number of observations

= (7.64+7.45+7.47+7.50+7.68+7.81+7.45+7.22+7.56+7.47+7.52+7.47)/12

= 7.52

b) For boiled water, the mean pH = (5.15+5.09+5.35+5.20+4.90+5.23+5.52+5.35+5.13+5.35+5.22+5.24)/12

= 5.2275

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