Find p, n or the variance from a relation between the binomial mean and variance

1. A.
   1.5
2. B.
   2.5
3. C.
   4.5
4. D.
   3.5

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1. A.
   0.4
2. B.
   0.8
3. C.
   0.18
4. D.
   0.2

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1. A.
   $\dfrac{8}{5}$
2. B.
   $\dfrac{2}{5}$
3. C.
   $\dfrac{24}{5}$
4. D.
   $\dfrac{4}{5}$

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1. A.
   $1$
2. B.
   $\dfrac{1}{2}$
3. C.
   $\dfrac{1}{3}$
4. D.
   $\dfrac{2}{3}$

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