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What is the result of this expression:
3.62 x (22.3 –20.3) /0.6655=
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- What is the median of the values 7.79, 8.24, 5.81, 4.97, 1.04, 7.39, and 7.22?Benzoin Tincture 18 mL Peru Balsam 10 g Cold Cream 70 g Sig cold sore ointment If benzoin tincture has a specific gravity of 0.88, calculate its percentage strength (w/w) in the mixture.The analysis shows different concentrations based on replicate determinations of Zn in a water sample: 0.754 mg, 0.721 mg, 0.734 mg, 0.731 mg and 0.742 mg. What is the absolute error if the standard solution has 0.750 mg of Zn?
- A chemist working in a hospital clinical laboratory obtained the following values for uric acid in blood serum: 4.63, 4.58, 4.82, 4.31, 4.67 and 4.60 mg%. What value should be reported as the mean? Value of QT at 90 % confidence level is 0.56.You are checking the accuracy of a volumetric flask marked 10.00 mL . To calculate the volume of water contained in the flask, you first measure the mass of the empty flask and the mass of the flask filled with water and take the difference. Then, you correct for the buoyancy factor and divide by the density of the water. The result of 8 such measurements is given in the table. Calculate the 95% confidence interval for these measurements with a mean of 10.03.The answer isn’t 0.0011, 0.0055, or 0.0071
- 1. σ=[(Σd2)/(n-1)]½ n= number of trials d= measured value - mean σ=[(8.50mL-8.74mL)2+(9.72mL-8.74mL)2+(8.00mL-8.74mL)2/(3-1)]½ 2. σ=[(Σd2)/(n-1)]½ n= number of trials d= measured value - mean σ=[(10.69-11.52)2+(11.80-11.52)2+(12.07-11.52)2/(3-1)]½What if the second was parts per million instead of parts per billion? Will the 10 to the exponent 6 will be the one that you will always divided by in situations like this?V26