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amm1812
2 years ago
6

vehicle is moving with 20 m/s towards the east and another is moving with 15 m/s towards the west. If both vehicle being to more

simultaneously from the same place. what will be the distance between them after 2 min .​
Mathematics
2 answers:
aivan3 [116]2 years ago
8 0

Answer:

600

Step-by-step explanation:

Distance = speed x time

2 min = 120 seconds

20 x 120 = 2400

15 x 120 = 1800

2400 - 1800 = 600

I'm not sure if u have to convert to seconds or keep it in minutes so I'm sorry if this is wrong

den301095 [7]2 years ago
5 0
4,200 meters
Or 4.2 km
Hope this helps good luck tho :)
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A random sample of 85 sixth-graders in a large city take a course designed to improve scores on a reading comprehension test. Ba
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Answer:

12.6 < \mu < 14.8

For this case we can find the margin of error like this:

ME= \frac{14.8-12.6}{2}= 1.1

Since we need to divide the width of the interval by 2.

And now with the margin of error we can find the sample mean with any of the two following ways:

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So for this case the correct answer would be:

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Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

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

The confidence interval for the mean is given by the following formula:  

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}} (1)  

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:  

df=n-1=85-1=84

We know that the confidence interval is given by:

12.6 < \mu < 14.8

For this case we can find the margin of error like this:

ME= \frac{14.8-12.6}{2}= 1.1

Since we need to divide the width of the interval by 2.

And now with the margin of error we can find the sample mean with any of the two following ways:

12.6 +1.1=13.7

14.8-1.1=13.7

So for this case the correct answer would be:

A. Sample Mean = 13.7; Margin of Error = 1.1

3 0
2 years ago
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Answer:

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