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Simora [160]
3 years ago
10

PLEASE HELP QUICK!!! WILL GIVE BRAINLIEST!!

Mathematics
1 answer:
Lera25 [3.4K]3 years ago
4 0

Answer:

\boxed{\bold{112}}

Step By Step Explanation:

Follow PEMDAS Order Of Operations

Calculate Within Parenthesis: \bold{120+\left(12\div \:3\cdot \:30\right): \ 240}

\bold{240\div \:20+10^2}

Calculate Exponents: \bold{10^2: \ 100}

\bold{240\div \:20+100}

Divide: \bold{240\div \:20: \ 12}

\bold{12+100}

Add

\bold{112}

➤ \boxed{\bold{Mordancy}}

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A research group needs to determine a 90% confidence interval for the mean repair cost for all car insurance small claims. From
lutik1710 [3]

Answer:

a) z = 1.645

b) The should sample at least 293 small claims.

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{1-0.9}{2} = 0.05

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 1-0.05 = 0.95, so z = 1.645, which means that the answer of question a is z = 1.645.

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.

(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?

They should sample at least n small claims, in which n is found when

M = 12, \sigma = 124.88. So

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

12 = 1.645*\frac{124.88}{\sqrt{n}}

12\sqrt{n} = 205.43

\sqrt{n} = \frac{205.43}{12}

\sqrt{n} = 17.12

\sqrt{n}^{2} = (17.12)^{2}

n = 293

The should sample at least 293 small claims.

8 0
2 years ago
Charlotte and Edgar's ages add up to 22. Charlotte is one year
nadya68 [22]

Answer: Charlotte's 15 and Edgar's 7

Step-by-step explanation:

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2 years ago
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Answer:

20

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Step-by-step explanation:

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Answer:C

Step-by-step explanation:

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3 years ago
The length of time, y hours, it takes to put a jigsaw puzzle together is inversely proportional to the number of children, x, wo
andrew11 [14]

Answer:

<em>24 children</em>

Step-by-step explanation:

If the length of time, y hours, it takes to put a jigsaw puzzle together is inversely proportional to the number of children, x, this is represented as;

y  \alpha \frac{1}{x}\\y =\frac{k}{x}

k is the constant of proportionality

If it takes 16 children 6 hours to put the jigsaw puzzle together, this means at x = 16, y = 6

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W are to find number of children needed to put the same jigsaw puzzle together in 4 hours, this is done by substituting k = 96 and y = 4 into the expression y = k/x

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<em>Hence it will take 24 children to put the same jigsaw puzzle together in 4 hours</em>

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