Answer:
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:

Dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd
the correct answer would be 4 3/4
hope this helps!
lmk if you would like an explanation! :)
<span>It's because there are 4 numbers in 4325, and only 3 in 798.
Hope I Helped You!!! :-)
Have A Good Day!!!</span>