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3 years ago

9/x+7 = 4 i need the answer for my homework, please help x

Mathematics

1 answer:

Pachacha [2.7K]3 years ago

4 0

Your answer is Answer:
x = -3

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Answer: b) 84

Step-by-step explanation:

Let p be the prior estimate of the required proportion.

As per given , we have

p =0.5 (The probability of getting heads on a fair coin is 0.5)

Significance level : $\alpha: 1-0.90=0.10\\$

Critical z-value (using z-value table ) : $z_{\alpha/2}=1.645$

Confidence interval width : w= 0.18

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Formula to find the sample size ( if prior estimate of proportion is known.):-

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$n=0.5(1-0.5)(\dfrac{1.645}{0.09})^2$

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Hence, the number of times we would have to flip the coin =<u>84</u>

hence, the correct answer is b) 84

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