1. Choose one kind of triangle to use for a tessellation: equilateral, isosceles, or scalene. 2. Use technology or paper to crea
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Answer:
Where and
We select a sample size of n =8. Since the distribution for X is normal then we know that the distribution for the sample mean is given by:
And the standard error would be:
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
Solution to the problem
Let X the random variable that represent the compressive strength of concrete of a population, and for this case we know the distribution for X is given by:
Where and
We select a sample size of n =8. Since the distribution for X is normal then we know that the distribution for the sample mean is given by:
And the standard error would be:
For this case we must simplify the following expression:
We must apply double C:
We apply distributive property in the numerator:
In the denominator we have by law of signs:
Different signs are subtracted and the sign of the major is placed:
ANswer: