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Helga [31]
2 years ago
10

Please help with question C

Mathematics
2 answers:
MAVERICK [17]2 years ago
4 0

Answer:

55% percentage mark up

Step-by-step explanation:

Formula = Gross profit /  Cost of item  * 100    First we find the Cost of item = 39.99 / 06 = 66.65 as 66.65 * 0.60 = 39.99  then we find the Gross profit 66.65 - 29.99 = 36.66 then plug into the formula  36.66/66.65 * 100 =55.0037509% = 55%

Dominik [7]2 years ago
4 0
55% thanks from my work
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Then the mean (first moment) is

E[X]=\displaystyle\int_{-\infty}^\infty x\,f_X(x)\,\mathrm dx=\frac1{80}\int_{670}^{750}x\,\mathrm dx=710

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E[X^2]=\displaystyle\int_{-\infty}^\infty x^2\,f_X(x)\,\mathrm dx=\frac1{80}\int_{670}^{750}x^2\,\mathrm dx=\frac{1,513,900}3

The second moment is useful in finding the variance, which is given by

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You get the standard deviation by taking the square root of the variance, and so

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