What is an underlying theme in the lottery

1 answer:

5 0

The Lottery Themes at a Glance. ... In "The Lottery," Shirley Jackson represents the notion of the scapegoat as someone who is blamed for the evils of a society and banished in order to expel sin and allow for renewal. ... The refusal of the townspeople to abandon tradition and question ...

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Almost 30% of the world today speaks Mandarin Chinese. A) TRUE B) FALSE

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Use midpoints to approxiamte the area under the curve y=f(x) 5 sin(xx)!+ 2.5 cos(4xx) on the interval [0,1] using 10 equal subdi

alisha [4.7K]

Subdividing [0, 1] into 10 equally spaced intervals of length $\Delta x=\frac{1-0}{10}=\frac1{10}$ gives the partition

$[0,1] = \left[0,\dfrac1{10}\right] \cup \left[\dfrac1{10},\dfrac2{10}\right] \cup \cdots \cup \left[\dfrac9{10},1\right]$

The $i$ -th subinterval has left and right endpoints, respectively, given by

$\ell_i = \dfrac{i-1}{10} \text{ and } r_i = \dfrac i{10}$

where $i\in\{1,2,3,\ldots,10\}$ .

The midpoint of the $i$ -th interval is the average of these,

$m_i = \dfrac{\ell_i+r_i}2 = \dfrac{2i-1}{20} \in \left\{\dfrac1{20},\dfrac3{20},\dfrac5{20},\ldots,\dfrac{19}{20}\right\}$

We approximate the area under $f(x)$ over [0, 1] by the Riemann sum,

$\displaystyle \int_0^1 f(x) \, dx \approx \sum_{i=1}^{10} f(m_i) \Delta x \\\\ ~~~~~~~~ = \frac1{10} \sum_{i=1}^{10} \bigg(5\sin(\pi m_i) + 2.5 \cos(4\pi m_i)\bigg) \\\\ ~~~~~~~~ = \frac{\sin\left(\frac\pi{20}\right) + \sin\left(\frac{3\pi}{20}\right) + \cdots + \sin\left(\frac{19\pi}{20}\right)}2 \\\\ ~~~~~~~~~~~~ + \dfrac{\cos\left(\frac\pi5\right) + \cos\left(\frac{3\pi}5\right) + \cdots + \cos\left(\frac{19\pi}5\right)}4 \\\\ ~~~~~~~~ \approx 3.19623$