3 years ago

How to write (1.5 x 10^-4) x (2.5 x 10^3) in scientific notation

Mathematics

1 answer:

maria [59]3 years ago

7 0

<h2>Answer:</h2>

The answer to your question is: (4 x 10^-1)

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450 is 75% of what number?

nataly862011 [7]

It is 600
u could have just looked it up...

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3 years ago

a sewing club is making a quilt consisting of 25 squares with each side of a square measuring 30cm.lf the quilt has 5 rows and 5

Lera25 [3.4K]

The total area is 625 because 25 x 5 = 125. 125 x 5 = 625. that is how you get your answer

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4 years ago

Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the po

vfiekz [6]

Answer:

b. 224

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.58$

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 want to find n, when $M = 0.5, \sigma = 2.9$ So

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

$0.5 = 2.58*\frac{2.9}{\sqrt{n}}$

$0.5\sqrt{n} = 7.482$

$\sqrt{n} = 14.964$

$(\sqrt{n})^{2} = (14.964)^{2}$

$n = 223.9$

The nearest integer number to 223.9 is 224.

So the correct answer is:

b. 224

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3 years ago

The probability of winning a game is 15%. If you play 20 times, how many times should you expect to win?

alex41 [277]

You should expect to win at least 3 times.
Hope this helps!

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3 years ago

Read 2 more answers

A cone has a height of 2.5 in. and a radius of 5 in. What is the volume of the cone?

LuckyWell [14K]

Answer:

65.45

Step-by-step explanation:

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3 years ago