Asked by Anonymous

Metal components for a machine have lengths which are normally distributed with mean 8 cm and standard deviation 4 cm.

A) the longest 10% of components require filling down. What is the smallest length of component which require filing down?

B) the shortest 15% of components have to be discarded. What is the smallest length of component which would not be discarded?

Please help

Thankyou
Answered by Steve
you can answer these and many other Z table things at

http://davidmlane.com/hyperstat/z_table.html
Answered by A J
3(a)X=Z×sd
X=85+(1.2816)x4
X=90.1264
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