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2.27 A student calibrates a 10mL pipet by filling it with pure water (d = 0.9970 g¡¤mL-1) and allowing the water to run into a beaker which weighs 74.242g. In four trails he obtains masses(water +beaker) of 84.136g, 84.151g, 84.141g, and 85.279g. What value would you advise him to report for the volume of the pipet?

2.28 The following values were obtained in parallel determinations of sulfur in a phosphor-bronze bearing metal: 0.097, 0.098, 0.100, 0.100, and 0.098 per cent. Obtain the average and standard absolute and relative deviations of the mean.

2.29 Five determinations of Cl in a chloride sample gave a mean of 32.30 per cent and S = 0.13 per cent absolute. State the interval within which the population mean lies at the 95 per cent confidence level.

2.30 Fire determinations of ZrO2 in a clay yielded the percentage 0.21, 0.23, 0.24, 0.22, and 0.23. How shall the average be reported? Why?

1HO, 0.2402g of the material was 2.31 In a determination of water in a sample of CaSO4 ¡¤22ignited to expel the water and the loss in weight found. If the weighings were made to ¡À0.1mg, how many figures shall be used in expressing the percentage?

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