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3 years ago

3/4(-10+2/5).......................

Mathematics

1 answer:

Ne4ueva [31]3 years ago

6 0

3/4(-10+2/5)

first do parenthesis

factor out -1 inside the parenthesis

3/4 * (-1*(10-2/5))

borrow from the 10

3/4 * (-1*( 9 5/5-2/5))

3/4 * -1(9 3/5)

change the mixed number to an improper fraction

3/4 * -1 ((5*9+3)/5)

3/4 * -1(48/5)

3/4 * (-48/5)

-144/20

divide by 4

-36/5

-7 r 1

-7 1/5

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4)In order to set rates, an insurance company is trying to estimate the number of sick daysthat full time workers at an auto rep

bagirrra123 [75]

Answer:

A sample of 18 is required.

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:

$\alpha = \frac{1 - 0.92}{2} = 0.04$

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 $1 - 0.04 = 0.96$ , so Z = 1.88.

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.

A previous study indicated that the standard deviation was 2.2 days.

This means that $\sigma = 2.2$

How large a sample must be selected if the company wants to be 92% confident that the true mean differs from the sample mean by no more than 1 day?

This is n for which M = 1. So

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

$1 = 1.88\frac{2.2}{\sqrt{n}}$

$\sqrt{n} = 1.88*2.2$

$(\sqrt{n})^2 = (1.88*2.2)^2$

$n = 17.1$

Rounding up:

A sample of 18 is required.

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3 years ago

If the coefficient of correlation is a positive value, then the slope of the regression line

ratelena [41]

Answer:

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Step-by-step explanation:

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3 years ago

What is equivalent to 48x-6+3y/3

DIA [1.3K]

Answer:

Step-by-step explanation:

We can divide 3 out of all three given terms:

3(16x - 2 + y/3)

is one possibility. Where are the answer choices that you were given?

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3 years ago

Thereisalinethatincludesthepoint(1, -10)andhasaslopeof

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Answer:

i dont know i am so sorry

Step-by-step explanation:

good luck with it though

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4 years ago

(200 x 3) + (50 x 3)

m_a_m_a [10]

200x3=600

50x3=150

600+150=750

750

6 0

3 years ago

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