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Morgarella [4.7K]
3 years ago
14

Tony Ring wants to attend Northeast College. If he deposits $37,644 today, how much will he have 4 years from now at 12% interes

t compounded semiannually?
Mathematics
1 answer:
Temka [501]3 years ago
7 0
\bf ~~~~~~ \textit{Compound Interest Earned Amount}
\\\\
A=P\left(1+\frac{r}{n}\right)^{nt}
\quad 
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\to &\$37644\\
r=rate\to 12\%\to \frac{12}{100}\to &0.12\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{semiannually, thus twice}
\end{array}\to &2\\
t=years\to &4
\end{cases}
\\\\\\
A=37644\left(1+\frac{0.12}{2}\right)^{2\cdot 4}\implies A=37644(1.06)^8
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Answer:

a) 0.7734

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Problems of normal distributions can be solved using the z-score formula.

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Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

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This is 1 subtracted by the pvalue of Z when X = 83. So

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Z = \frac{83 - 101}{24}

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