Answer
From Table 1, n=15, P=0.3,
a. at least 4 = $P(x \geq 4) $ = 1-$P(x\lt4)$ = 1-(0.0047+0.0305+0.0916+0.1700) = 0.7031
b. 1 to 3 = $P(1 \leq x \leq 3 )$ = 0.3052+0.0916+0.17 = 0.2921
c. at most 5 = $P(x \leq 5)$ = 0.0047+0.0305+0.0916+0.17+0.2186+0.2061 = 0.7217
Work Step by Step
See above.