What is the probability that the mean time for the sample of 100 returns is between 88 minutes and 92 minutes?

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A coin is flipped three times; give the probability distribution of the number of heads. ... waiting to be served in a certain bank was counted every 15 minutes for five hours. ... 11) Suppose that theprobability that a federal income tax return contains an .... 35) A certain probability distribution hasmean 100 and variance 5.

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Find dy/dx by differentiating implicitly x^2y+3xy^3-x=3

AleksandrR [38]

$\dfrac{\mathrm d}{\mathrm dx}\left[x^2y+3xy^3-x\right]=\dfrac{\mathrm d}{\mathrm dx}[3]$
$2xy+x^2\dfrac{\mathrm dy}{\mathrm dx}+3y^3+9xy^2\dfrac{\mathrm dy}{\mathrm dx}-1=0$
$(x^2+9xy^2)\dfrac{\mathrm dy}{\mathrm dx}=1-2xy-3y^3$
$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{1-2xy-3y^3}{x^2+9xy^2}$