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Gelneren [198K]
3 years ago
6

Nan’s art sculpture is a pyramid. She will cover all the faces with gems, except the base of the pyramid.

Mathematics
2 answers:
Naya [18.7K]3 years ago
8 0

Answer:

A=36

Step-by-step explanation:

12 times 3 equals 36 plus i took quiz  so yeah

marysya [2.9K]3 years ago
6 0

Answer:

it is 54

Step-by-step explanation:

i took the test and checked the answer

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A researcher studied the radioactivity of asbestos. She sampled 81 boards of asbestos, and found a sample mean of 193.2 bips, an
Ksivusya [100]

Answer:

a) Confidence interval is (182.86,203.54).

b) (i) Yes, 200 bips is a true mean as it lie in the interval.

(ii) No, 210 bips is not a true mean as it doesn't lie in the interval.

Step-by-step explanation:

Given : A researcher studied the radioactivity of asbestos. She sampled 81 boards of asbestos, and found a sample mean of 193.2 bips, and a sample standard deviation of 49.5 bips.

To find : (a) Obtain the 94% confidence interval for the mean radioactivity. (b) (i) According the interval that you got, is 200 bips a plausible value for the true mean? (ii) What about 210 bips?

Solution :

a) The confidence interval formula is given by,

\bar{x}-z\times \frac{\sigma}{\sqrt{n}}

We have given,            

The sample mean \bar{x}=193.2 bips

s is the standard deviation \sigma=49.5 bips

n is the number of sample n=81

z is the score value, at 94% z=1.88

Substitute all the values in the formula,

193.2-1.88\times \frac{49.5}{\sqrt{81}}

193.2-1.88\times 5.5

193.2-10.34

182.86

Confidence interval is (182.86,203.54).    

b) (i) According the interval 182.86

200 bips a plausible value for the true mean as it lies in the interval.

(ii) 210 bips not lie in the confidence interval so it is not a true mean.

3 0
3 years ago
A fair coin was flipped 50 times. It landed on heads 29 times.
faust18 [17]

Answer:

21/50, 42%

Step-by-step explanation:

The total times the coin was flipped is 50 and the number of times it landed on tails is 50-29=21. So we need to divide 21 by 50, which gives us 42%.

7 0
3 years ago
Dange measures and finds that she can do a vertical jump of 27.5% of her height. If Dange is 48 inches tall, how high can she ju
sveta [45]

\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{27.5\% of 48}}{\left( \cfrac{27.5}{100} \right)48}\implies 13.2

5 0
3 years ago
What is the area of a rectangle with a length of 3 cm and width of 4.5 cm
____ [38]
13.5 because 4.5 times 3 is 13.5

3 0
3 years ago
for every 5 coins carmen gets, she gives 2 to her brother frank. if carmen has 9 coins, how many does frank have?
Sphinxa [80]
Carmen has given 6 coins to her brother<span />
3 0
3 years ago
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