Answer :
Given data is :
Sample size n = 5
Mean =
standard deviation =
Here we need to find the probability that a random sample of n = 5 specimens will have a sample diameter that falls in the interval from 2499 psi to 2510 psi.
i.e P(2499 < X < 2510)
P(2499 < X < 2510) = P(X < 2510) - P(X < 2499)
=
=
=
=
Using z tabble values,
= 0.6736 - 0.4812
= 0.1925
therefore,
sample diameter = 0.193
The comprehensive strength of concrete is normally distributed with u = 2500 psi and o =...
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