In an experiment, the mass of a sample is recorded as 20.5 g, 20.6 g, and 20.7 g. The balance used has an uncertainty of ±0.1 g. What is the best estimate of the mass of the sample?Select one:a.20.7 gb.20 gc.20.5 gd.20.6 g

When non-metric units were used in the United Kingdom, a unit of mass called the pound-mass (lbm) was employed, where 1lbm=0.4539kg1lbm=0.4539kg . (a) If there is an uncertainty of 0.0001kg0.0001kg in the pound-mass unit, what is its percent uncertainty? (b) Based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1 kg when converted to kilograms?

A random sample of 12 items is taken and is found to have a meanweight of 50 grams and a standard deviation of 9 gramsWhat is the mean weight of population1. with 95% confidence2. with 99% confidence

Match the following word pairs concerning when you would use which balance and what technique (addition or difference) is required.Group of answer choicesWeighing 15.0 g accurately (but as quickly as possible)Weighing 0.01 g accuratelySmall losses in mass would have large effects on experimental resultsSmall losses in mass would not have large effects on experimental results (and speed is required)

You are preparing a solution and you record the following data.                Mass of NaCl = 9.93 g ± 0.01 g                Volume of volumetric flask = 200.00 cm3 ± 0.15 cm3M  NaCl = 58.44 g mol–1What is the correct concentration of the solution together with the absolute uncertainty?

A random sample of 59 avocados is selected from an orchard and the weight of each avocado is measured. The mean weight is 288.3 grams and the standard deviation is 95.6 grams.Calculate the standard error.