Answer
Cumulative Poisson Distribution Table is formed as follows:
a. a. λ=20
P P(x=20) =$\frac{20^{25}e^{-20}}{25!}$=0.04459
b. i. $P(x\leq12)$ = 0.039
ii. $P(13 \leq x \leq 17)$ = $P(x\leq17) $-$P(x\leq12) $ = 0.2970-0.0390 = 0.258
iii. $P(x\geq30)$ = 1-$P(x\leq29) $ = 1-0.9782 = 0.0218
Work Step by Step
see above
