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vesna_86 [32]
3 years ago
13

Car A went 60 km in 5 6 hour while a car B went 54 km in 2 3 hour. Which car was faster? How many times faster?

Mathematics
1 answer:
Alexxx [7]3 years ago
4 0

Answer:car B is faster

Step-by-step explanation:

Car A:

Speed=distance ➗ time

Speed=60 ➗ 5/6

Speed=60 x 6/5

Speed=(60x6)/5

Speed=360/5

Speed of car A=72 km/hr

Car B:

Speed=distance ➗ time

Speed=54 ➗ 2/3

Speed=54 ➗ 2/3

Speed=54 x 3/2

Speed=(54x3)/2

Speed=162/2

Speed of car B=81 km/hr

Therefore car B is faster

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umka21 [38]

Answer:

The margin of error is of 0.01.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a pvalue of 1 - 0.15 = 0.85, so Z = 1.037.

The margin of error is of:

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

Standard deviation was 0.21.

This means that \sigma = 0.21

Sample of 450:

This means that n = 450

What is the margin of error, assuming a 70% confidence level, to the nearest hundredth?

M = z\frac{\sigma}{\sqrt{n}}

M = 1.037\frac{0.21}{\sqrt{450}}

M = 0.01

The margin of error is of 0.01.

4 0
3 years ago
The plot shown below describes the relationship between student scores on the first exam in a class and their corresponding scor
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you average the scores by adding scores from exam 1 and exam 2 then divide it by 2 to average the exam scores

Step-by-step explanation:

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3 years ago
McDonald's is the king of the burger world, as it has more hamburger joints than any other restaurant chain. In 2013, McDonald's
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The notation per capita simply means that the number is divided by the total population. Therefore the number of McDonald’s per capita in Canada 2013 is:

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3 years ago
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