The car at each vertex of a Ferris wheel holds a maximum of 5 people. The sum of the measures of the angles of the Ferris wheel
is 7740º. What is the maximum number of people that the Ferris wheel can hold?
1 answer:
The Ferris wheel has the shape of a regular n-gon (regular polygon with n vertices).
check the pictures attached to verify the following rule: the diagonals of a vertex divide a n-gon into (n-2) triangles.
This means that the sum of the measures of the interior angles of a n-gon is 180°(the sum of the measures of the interior angles of a triangle ) * (n-2), which is the total number of triangles constructed this way.
In a regular polygon, this total sum, is equally 'distributed' to each of the n vertices.
Conclusion:
the sum of the measures of a regular n-gon is 180(n-2)
the measure of 1 angle of a regular n-gon is
In our problem, the sum of the measures of the interior angles is 7740º. So to find n, the number of vertices of the polygon:
<span>
7740º=180(n-2)
n-2=7740</span>°/180°<span>=43
n=45
So the Ferris wheel has 45 vertices, so 45 cars, each of which can hold 5 people.
Maximum number the Ferris can hold is 45*5=225 people</span>
check the pictures attached to verify the following rule: the diagonals of a vertex divide a n-gon into (n-2) triangles.
This means that the sum of the measures of the interior angles of a n-gon is 180°(the sum of the measures of the interior angles of a triangle ) * (n-2), which is the total number of triangles constructed this way.
In a regular polygon, this total sum, is equally 'distributed' to each of the n vertices.
Conclusion:
the sum of the measures of a regular n-gon is 180(n-2)
the measure of 1 angle of a regular n-gon is
In our problem, the sum of the measures of the interior angles is 7740º. So to find n, the number of vertices of the polygon:
<span>
7740º=180(n-2)
n-2=7740</span>°/180°<span>=43
n=45
So the Ferris wheel has 45 vertices, so 45 cars, each of which can hold 5 people.
Maximum number the Ferris can hold is 45*5=225 people</span>
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Answer:
There is a 5.5% probability that a random sample of passengers will have a mean weight that is as extreme or more extreme (either above or below the mean) than was observed in this sample.
Step-by-step explanation:
To solve this problem, we have to understand the normal probability distribution and the central limit theorem.
Normal probability distribution
In a set with mean and standard deviation
, the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation
, a large sample size can be approximated to a normal distribution with mean
and standard deviation
.
In this problem, we have that:
The weights of a random sample of 48 commercial boat passengers were recorded. The sample mean was determined to be 177.6 pounds. Find the probability that a random sample of passengers will have a mean weight that is as extreme or more extreme (either above or below the mean) than was observed in this sample.
The probability of an extreme value below the mean.
This is the pvalue of Z when X = 177.6.
So
By the Central Limit Theorem
has a pvalue of 0.0274.
So there is a 2.74% of having a sample mean as extreme than that and lower than the mean.
The probability of an extrema value above the mean.
Measures above the mean have a positive z score.
So this probability is 1 subtracted by the pvalue of
has a pvalue of 0.9726.
So there is a 1-0.9726 = 0.0274 = 2.74% of having a sample mean as extreme than that and above than the mean.
Total:
2*0.0274 = 0.0548 = 0.055
There is a 5.5% probability that a random sample of passengers will have a mean weight that is as extreme or more extreme (either above or below the mean) than was observed in this sample.
Answer:
Step-by-step explanation:
The coordinates are (5,7) and (-3,4)
Distance Formula =
D =
D =
D =
D =
D = 8.5 units