Hello can you please help me posted picture of question

Mathematics

1 answer:

stellarik [79]2 years ago

8 0

Correct answer is option B

The solution is listed below:

$(-10 x^{3}+4x+5)+(5 x^{2} -2x) \\ \\ 
= -10 x^{3}+4x+5+5 x^{2} -2x \\ \\ 
=-10 x^{3}+5 x^{2} +2x+5$

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3 years ago

Suppose the true proportion of students at a college who study abroad is 0.25. I select a random sample of 40 students from the

Julli [10]

Answer:

$\mu_{\hat p} = 0.25$

$\sigma_{\hat p}= \sqrt{\frac{0.25*(1-0.25)}{40}}= 0.0685$

$z = \frac{0.2-0.25}{0.0685}= -0.730$

And we can use the normal standard distribution or excel to find this probability and we got:

$P(\hat p$

Step-by-step explanation:

We define the parameter as the proportion of students at a college who study abroad and this value is known $p =0.25$ , we select a sample size of n =40 and we are interested in the probability associated to the sample proportion, but we know that the distirbution for the sample proportion is given by: