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Rzqust [24]
3 years ago
7

Bernard and Adriana grew sunflowers in their backyard. Bernard's sunflower grew 4.23 cm in one week and 8.91 cm the second week.

Adriana's sunflower grew 15.12 cm in two weeks. Round each number to the nearest tenth. About how much more did Adriana's sunflower grow than Bernard's? A. about 1.7 cm B. about 1.8 cm C. about 1.9 cm D. about 2.0 cm
Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
6 0
The answer is D. 2.0 because you start with 4.23 8.91 and 15.12 when it says round each number to the nearest tenth you round every number on the page now you have: 4.2, 8.9, and 15.1t hen you add 4.2 and 8.9 and get 13.1

now all you have to do is subtract 15.1 - 13.1= 2.0 or 2 and that is why D. is the answer

hope this helps 
Marina CMI [18]3 years ago
5 0
The answer to this question is D
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A simple random sample of size nequals10 is obtained from a population with muequals68 and sigmaequals15. ​(a) What must be true
valentina_108 [34]

Answer:

(a) The distribution of the sample mean (\bar x) is <em>N</em> (68, 4.74²).

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(c) The value of P(\bar X\geq 69.1) is 0.3670.

Step-by-step explanation:

A random sample of size <em>n</em> = 10 is selected from a population.

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Since the sample selected is not large, i.e. <em>n</em> = 10 < 30, for the distribution of the sample mean will be approximately normally distributed, the population from which the sample is selected must be normally distributed.

Then, the mean of the distribution of the sample mean is given by,

\mu_{\bar x}=\mu=68

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(b)

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P(\bar X\geq 69.1)=P(\bar X> 69.1+0.5)

                    =P(\bar X>69.6)

                    =P(\frac{\bar X-\mu_{\bar x}}{\sigma_{\bar x}}>\frac{69.6-68}{4.74})

                    =P(Z>0.34)\\=1-P(Z

Thus, the value of P(\bar X\geq 69.1) is 0.3670.

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