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dalvyx [7]
3 years ago
15

Most of the savings accounts at stonebrook community bank are earning simple interest. the formula to calculate the amount of si

mple interest is a=p(1 rt), where a is the total amount, p is the principal amount, r is the interest rate, and t is the time. explain what you need to do to derive a formula for the principal amount if you know: how much simple interest has been earned, the rate, and the amount of time.
Mathematics
1 answer:
Maurinko [17]3 years ago
4 0
P=i/rt
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Hope it helps
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Answer:

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Step-by-step explanation:

The random variable <em>X</em> can be defined as the number of guests until the next one pays by American Express credit card

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The random variable <em>X</em> follows a Geometric distribution since it is defined as the number of trials before the first success.

The probability mass function of <em>X</em> is:

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(a)

The expected value of a Geometric distribution is:

E(X)=\frac{1-p}{p}

Compute the expected number of guests until the next one pays by American Express credit card as follows:

E(X)=\frac{1-p}{p}

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(b)

Compute the probability that the first guest to use an American Express is within the first 10 to checkout as follows:

P(X=10)=(1-0.20)^{10}\times0.20

                 =0.1073741824\times 0.20\\=0.02147483648\\\approx0.0215

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