The comprehensive strength of concrete is normally distributed with μ = 2500 psi and σ = 50 psi. find the probability that a random sample of n = 5 specimens will have a sample mean diameter that falls in the interval from 2499 psi to 2510 psi.

The probability that the diameter falls in the interval from 2499 psi to 2510 psi is 0.00798.

Step-by-step explanation:

Let's define the random variable, "Comprehensive strength of concrete". We have information that is normally distributed with a mean of 2500 psi and a standard deviation of  50 psi (or a variance of 2500 psi). In other words, .

We want to know the probability of the mean of X or that falls in the interval . From inference theory we know that :

Now we can find the probability as follows:

Where , then:

1 1/4 hours

step-by-step explanation:

2/4 + 2/4 + 1/4 = 5/4 or 1 1/4

1 3 5

step-by-step explanation:

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