An article describes the chemical compositions of certain minerals in the early

Question

An article describes the chemical compositions of certain minerals in the early Archaean mantle. For a certain type of olvine randomly chosen rock has mean 40.25 and standard deviation 0.37 assembly,the silcon diaxide (Si0,) content On weight percent in a References eBook&Resources; Section Break Difficulty Easy Chapter: 02 Probability Section: 02.05 Linear Functions of Random Variables 24. Required information 3.44 points Find the mean and standard deviation of the sample mean SiO2 content in a random sample of 10 rocks. Round the mean to two decimal places Mean 40.25 Standard deviation Hints References eBook &Resources; Hint#1 2D 3 F2

Explanation / Answer

Solution25:

standard deviation of sample means=s=population stddev/sqrt(n)

given this value as 0.05

and population std dev=0.37

substitute

0.05=0.37/sqrt(n)

sqrt(n)=0.37/0.05

n=sqrt(7.4)

n=2.72

n=3

required sample size

ANSWER:3

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