#1. Wool fibre breaking strengths are normally distributed with mean= 23.56 Newtons and standard deviation, =...

#1. Wool fibre breaking strengths are normally distributed with mean= 23.56 Newtons and standard deviation, = 4.55.

a) what proportion of fibres would have a breaking strength of 14.45 or less?

b)what proportion of fibres would have a breaking strength of 12.45 or more?

c) what proportion of fibres would have a breaking strength between 20 and 30?

d) what proportion of fibres would have a breaking strength between 19.01 and 28.11?

Expert Solution

the table provided is for P(0<Z<z) for eg if z=1.44 then we take the value where the row containing 1.4 and column containing 4 intersect which is 0.4265 .

orchestra answered 2 years ago

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