Long term testing of concrete shows that the mean strength (u) is 3500 psi with a standard deviation (o) of 400 psi. (a) Assuming a normal distribution, use the standard normal table provided to find the probability P(x) that concrete strength is at least 3000 psi. P(x ≥ 3000) = Z = X - H 050 b) If 25 samples of concrete are tested, find the probability P(x) that the sample mean is at least 3540 psi.

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Q: Could you further explain how you got this?

A: Given data :  n = 4 u = 35000 o = 5000 P(x > 40000) = ?

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