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The average thickness of books in the library shelf is 8.3 cm the standard deviation is...

The average thickness of books in the library shelf is 8.3 cm the standard deviation is 0.6 cm if 20% of the books are oversized find the minimum thickness of the oversize books on the library shelf assume the bearable is normally distributed
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Answer #1
mean μ= 8.3
standard deviation σ= 0.6000

as top 20% are at 80th percentile:

for 80th percentile critical value of z= 0.84
therefore corresponding value=mean+z*std deviation= 8.80
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