Answer:
And using a calculator, excel or the normal standard table we have that:
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".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:
Where and
They select a sample size of n=9 people.The distribution for the sample mean is given by:
And we want to find this probability:
In order to the helicopter can safely lift off. We can use the z score formula given by:
And using a calculator, excel or the normal standard table we have that:
Answer:
20
Step-by-step explanation:
2 x k = 40
2 x 20 = 40
k = 20
check- 40= 20x2
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12 - 5(3r + 2) = 17 |use distributive property a(b + c) = ab + ac
12 - 15r - 10 = 17
2 - 15r = 17 |subtract 2 from both sides
-15r = 15 |divide both sides by (-15)
r = -1
The midpoint is (0, 1/2)
hope this helps
The answer is log(b^13 y^7 X^6).Hope this helps!!