## Elementary Statistics (12th Edition)

The mean of the deaths:$\frac{196}{20}=9..8$ By using the formula: a)$P(X=0)=\frac{9.8^0\cdot e^{-9.8}}{0!}=0.00005.$ b)$P(X=1)=\frac{9.8^1\cdot e^{-9.8}}{1!}=0.0005.$ c)$P(X=2)=\frac{9.8^2\cdot e^{-9.8}}{2!}=0.0027.$ d)$P(X=3)=\frac{9.8^3\cdot e^{-9.8}}{3!}=0.0087.$ e)$P(X=4)=\frac{9.8^4\cdot e^{-9.8}}{4!}=0.021.$