The batting average for 1990-1999 can be approximated by a normal distribution with a mean= 0.270...

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The batting average for 1990-1999 can be approximated by a normal distribution with a mean= 0.270...

The batting average for 1990-1999 can be approximated by a normal distribution with a mean= 0.270 and standard deviation 0.030. Find the 90th percentile for the batting averages.

math Statistics-And-Probability

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Answer 1

Answer #1

mean μ=	0.27
standard deviation σ=	0.0300

for 90th percentile critical value of z=		1.2816
therefore corresponding value=mean+z*std deviation=			0.3084 ~ 0.308

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Answer 2

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The batting average for 1990-1999 can be approximated by a normal distribution with a mean= 0.270...

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