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KMFDS
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If positive integer $${n}\le{3}$$ and n is the number of times a coin is flipped, what is the value of n?(1) The probability of getting heads exactly once is $$\frac{1}{2}$$.(2) The probability of getting at least one tail is greater than $$\frac{1}{2}$$.
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KMFDS
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Is the standard deviation of the set of measurements $${x}_{1}$$, $${x}_{2}$$, $${x}_{3}$$, $${x}_{4}$$,....$${x}_{20}$$ less than 3 ?(1) The variance for the set of measurements is 4.(2) For each measurement, the difference between the mean and that measurement is 2.
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KMFDS
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If a and b are positive, is $$(a^{-1}+b^{-1})^{-1}$$ less than $$(a^{-1}*b^{-1})^{-1}$$?(1)$$a = 2b$$(2)$$a + b > 1$$
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KMFDS
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If $${X}^{2}+{Y}^{2}={1}$$, is X+Y=1?(1) XY=0(2) Y=0
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KMFDS
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If (y+3)(y-1) - (y-2)(y-1) = r(y-1), what is the value of y?(1) $${r}^{2}={25}$$(2) r = 5
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