2 years ago

If a+b=8 and b-a= -5 then a^2 - b^2=

Mathematics

1 answer:

iren2701 [21]2 years ago

5 0

Answer:

sorry if i am wrong but i think it is 40

Step-by-step explanation:

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The probability is 1/4 or 25%

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Hey everyone! Please help me figure this out...

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See below

Step-by-step explanation:

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Answer: a) Required minimum sample size= 219

b) Required minimum sample size= 271

Step-by-step explanation:

As per given , we have

Margin of error : E= 5% =0.05

Critical z-value for 90% confidence interval : $z_{\alpha/2}=1.645$

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Formula to find the sample size :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.28(1-0.28)(\dfrac{1.645}{0.05})^2\\\\=218.213856\approx219$

Required minimum sample size= 219

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Formula to find the sample size :-

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Answer:

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