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2 years ago

I have this one question I still dont get what 12/4 plus 12/5 is

Mathematics

1 answer:

zalisa [80]2 years ago

7 0

12/4 + 12/5 = the answer is 5.4

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Please helppp I suckk at fractions!!!

wel

Answer: a=2 b= 11/6 or 1 5/6

Step-by-step explanation:

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3 years ago

Which graph has a slope of 4/5 ?

Crank

Answer:

quadratic

Step-by-step explanation:

maybe you can try searching in google

8 0

2 years ago

Read 2 more answers

Expanded number is 7,080,287

stiv31 [10]

7,000,000+80,000+200+80+7

6 0

2 years ago

Domain and range for y=2+x^2

olga nikolaevna [1]

The domain is the x-axis, and the range is the y values. The domain would be
-∞ to ∞. And the range is 2 to ∞.

7 0

3 years ago

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

3 years ago