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AleksandrR [38]
3 years ago
8

Can someone please help me with all the question up to 49

Mathematics
1 answer:
Igoryamba3 years ago
4 0

Solve the top, then solve the bottom, and divide the top by the bottom.

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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.

3 0
3 years ago
Whats the correct answer ?
11Alexandr11 [23.1K]

Answer:

$80, $48

Step-by-step explanation:

The original price was x.

The price is reduced by 40%. The markdown is 40% of x, or 0.4x.

The actual dollar amount of the markdown is $32.

That means that 0.4x must equal $32.

We set up an equation and solve for x, the original price.

0.4x = 32

Divide both sides by 0.4

x = 32/0.4

x = 80

The original price is $80.

The markdown is $32.

$80 - $32 = $48

The marked down price is $48.

Answer: $80, $48

3 0
3 years ago
Look at the photo plz !!
sergejj [24]

Answer:

11 0ver 54

Step-by-step explanation:

4 0
3 years ago
Part 1: Add: 3 3/8 + 7 3/4<br> Part 2: Subtract: 12 3/8 - 8 1/5
Yuliya22 [10]
Part one is 11 1/8.
part two is 4 7/40.
4 0
3 years ago
Read 2 more answers
Hal ran 1 2/5 miles on Monday and 3/4 of a mile on Tuesday. How far did he run in total for the two days?
spin [16.1K]

Answer:

2.12 miles

Step-by-step explanation:

5 0
2 years ago
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