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A box contains 126000 red marbles and 885000 yellow marbles. What sample size is required to reduce the sampling standard deviation of red marbles to 1.85% ?

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Reid Wolff
Reid WolffLv2
28 Sep 2019
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Related questions

In lab you determined the volume of 12 marbles and the mass of 18.0 mL of water. Use the following data, which should closely approximate your results, to answer the questions below.
Mass of 18.0 mL of water 18.01 g
Mass of 12 marbles
(from Data Table B) WebAssign will check your answer for the correct number of significant figures. g
Volume of 12 marbles 19.6 mL
(a) What are the densities determined from the data above?
water WebAssign will check your answer for the correct number of significant figures. g/mL
marbles WebAssign will check your answer for the correct number of significant figures. g/mL

(b) The number of moles of water present in 18.01 g of water is WebAssign will check your answer for the correct number of significant figures. mol.

(c) Use scientific notation for the number of water molecules in 18.01 g of water. (Enter your answer using the format 2.2e21 for 2.2 1021.)
WebAssign will check your answer for the correct number of significant figures. molecules

(d) What is the mass of a single molecule of water?
WebAssign will check your answer for the correct number of significant figures. g

(e) How many water molecules would have the mass of one marble?
WebAssign will check your answer for the correct number of significant figures. molecules

(f) Neglect empty space between molecules and calculate the average volume of a water molecule.
WebAssign will check your answer for the correct number of significant figures. mL

(g) What is the average volume of a marble?
WebAssign will check your answer for the correct number of significant figures. mL

(h) How many water molecules could fit in the same volume as one marble?

Atoms of different elements also have different average masses,just like kernels and marbles. Use the mass values from a periodictable to answer the following questions. Please use the precisionof the values in the periodic table link to determine the correctnumber of significant figures for your answer.
(a) What is the relative mass of one atom of B to one atom ofN?



(b) What is the relative mass of one mole of B to one mole ofN?




(c) What is the relative mass of 1.0 moles of Al to 1.0 moles ofRh?

Atoms of different elements also have different average masses, just like kernels and marbles. Use the mass values from a periodic table to answer the following questions. Please use the precision of the values in the periodic table link to determine the correct number of significant figures for your answer.
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matom of F
= WebAssign will check your answer for the correct number of significant figures.


(b) What is the relative mass of one mole of H to one mole of F?
mmole of H
mmole of F
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mmole of Ag
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