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kodGreya [7K]
3 years ago
5

Point O is the centroid of triangle ABC. If OD=3x -2 and OC= 5x, find x.

Mathematics
1 answer:
Nesterboy [21]3 years ago
6 0

At centroid medians bisect each other in the ratio 2:1

\\ \sf\longmapsto OC=2(OD)

\\ \sf\longmapsto 2(3x-2)=5x

\\ \sf\longmapsto 6x-4=5x

\\ \sf\longmapsto 6x-5x=4

\\ \sf\longmapsto x=4

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3 years ago
Assume that the empirical rule is a good model for the time it takes for all passengers to board an airplane. The mean time is 4
slamgirl [31]

Answer:

The interval that describes how long it takes for passengers to board the middle 95% of the time is between 40.16 minutes and 55.84 minutes.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

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.

In this problem, we have that:

\mu = 48, \sigma = 4.

Which interval describes how long it takes for passengers to board the middle 95% of the time?

This is between the 2.5th percentile and the 97.5th percentile.

So this interval is the value of X when Z has a a pvalue of 0.025 and the value of X when Z has a pvalue of 0.975

Lower Limit

Z has a pvalue of 0.025 when Z = -1.96. So

Z = \frac{X - \mu}{\sigma}

-1.96 = \frac{X - 48}{4}

X - 48 = -1.96*4

X = 40.16

Upper Limit

Z has a pvalue of 0.975 when Z = 1.96. So

Z = \frac{X - \mu}{\sigma}

1.96 = \frac{X - 48}{4}

X - 48 = 1.96*4

X = 55.84

The interval that describes how long it takes for passengers to board the middle 95% of the time is between 40.16 minutes and 55.84 minutes.

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3 years ago
Dafjjfdsfrdddddddd DISJFJIASJIFAJIFAIJIJASJDIASIJDJAISDJAIS
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Answer:

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Step-by-step explanation:

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3 years ago
What is the measure of XYZ (MULTIPLE CHOICE)
Aliun [14]
The measure of XYZ is:

C. 120
7 0
3 years ago
I need help..... I don't understand at all
cluponka [151]
I think you have to estimate to a whole so 2 1/2 would be 3
8 0
3 years ago
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