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1. Resolves the following: The determination of calcium in a water sample is carried out, by means of 10 measurements made to the same sample under the conditions of repeatability. The results found are as follows: 1 10.25 8 2 10.34 3 10.18 Calcium Content in Water (mg/L) 4 5 6 7 10.29 10.26 10.28 10.22 9 10.30 10 10.20 10.24 1. 2. 3. Define the measurand. Calculates type A uncertainty with t-student distribution with a confidence level (p) of 90%. The instrument used is a digital photometric meter, which measures hardness in water and has a resolution of +0.01 mg/L according to the manufacturer. Calculate standard uncertainty type B. Calculate the combined uncertainty. Calculate the expanded uncertainty with a coverage factor (KR) of 1.645. If asked to indicate the latest measure, how would you report this measure in terms of expanded uncertainty? 4. 5. 6