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3 years ago

( -8) +5+4+(-2) pls aa

Mathematics

1 answer:

cupoosta [38]3 years ago

8 0

B. just took the test

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Gribbles are small, pale white, marine worms that bore through wood. While sometimes considered a pest since they can wreck wood

Stells [14]

<u>Answer with explanation:</u>

As per given , we have

A sample of 50 gribbles finds an average length of 3.1 mm with a standard deviation of 0.72.

i.e. n= 50

Degree of freedom = n-1=49

$\overline{x}=3.1\ mm$

$s=0.72\ mm$

The point estimate of the population mean is equals to the sample mean.

i.e. The best estimate for the length of gribbles= 3.1 mm

Also, population standard deviation is unknown , then the confidence interval would be :

$E=t_{\alpha/2, df}\dfrac{s}{\sqrt{n}}$

For df= 49 and significance level of 0.05 , the t- value (using t-distribution table) would be :

$t_{0.05/2, 49}=t_{0.025, 49}= 2.010$

Now, Margin of error : $E=(2.010)\dfrac{0.72}{\sqrt{50}}$

$=0.204664986747\approx0.20$

95% confidence interval : $(\overline{x}-E,\ \overline{x}+E)$

$i.e.\ (3.1-0.20, 3.1+0.20)=(2.90,\ 3.30)$

3 0

4 years ago

I need help asap like nowwwwwwwww

Allisa [31]

A.) Both services will cost the same if it is for a 3 hours service.

B.) 16+9X=20+7X.

=>9x-7x=20-16.

=>2x=4.

=>x=4/2.

=>x= 2.

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3 years ago

A furniture manufacturer shipped 26 cartons to a store. Each carton weights 235 pounds. What is the total weight of the cartons

UNO [17]

Answer:

6,110lbs

Step-by-step explanation:

235×26=6,110

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klemol [59]

Answer:

The blue dot is at -5

Step-by-step explanation:

If this answer is correct, please make me Brainliest!

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4 years ago

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HELP PLEASE

jok3333 [9.3K]

Answer:

Step-by-step explanation:

I mean I believe its b it looks like theres three

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