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1. The surface area of a cone S is S= 
, where r is the radius of the base and l is the slant height.
2. The slant height l is found as follows:
3.
4. The answer is C
2. The slant height l is found as follows:
3.
4. The answer is C
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: