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4 years ago

How long did it take a bike to travel 20 miles at 12 mph?

Mathematics

1 answer:

kow [346]4 years ago

8 0

Answer:

1 hour 40 minutes

Step-by-step explanation:

Since each hour the bike goes 12 miles and the distance is 20 miles in total

d=r/t so

12=20/t (multiply by t)

12t=20 (divide by 12)

t= 1 and 2/3 hours=

1 hour 40 minutes

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2 years ago

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3 years ago

What is the GCF 16 24 40

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3 years ago

Suppose the population standard deviation is σ = 5 , an SRS of n = 100 is obtained, and the confidence level is chosen to be 98%

beks73 [17]

Answer:

1.165.

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:

$\alpha = \frac{1-0.98}{2} = 0.01$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.01 = 0.99$ , so $z = 2.33$

Now, find the margin of error M as such

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

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

In this problem, we have that:

$\sigma = 5, n = 100$ . So

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

$M = 2.33*\frac{5}{\sqrt{100}} = 1.165$

So the correct answer is:

1.165.

6 0

4 years ago