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3 years ago

13

Tessa had $90 in her checking account. She paid her cable/internet bill for $60. She deposited $50 from her part-time job before

writing a check for $65 to pay her credit card bill. What is Tessa's account balance?

2 answers:

LenKa [72]3 years ago

6 0

The answer is $15 in her account

Lady bird [3.3K]3 years ago

4 0

90-60+50-65=15

$15 in her account

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Step-by-step explanation:

We need to remember that the confidence interval for the true proportion is given by :

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Part a

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The margin of error for the proportion interval is given by this formula:

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$n=\frac{0.76(1-0.76)}{(\frac{0.01}{1.64})^2}=4905.83$

And rounded up we have that n=4906

Part b

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$n=\frac{0.5(1-0.5)}{(\frac{0.01}{1.64})^2}=6724$

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