Answer
a. $0.020$
b. $0.217$
Work Step by Step
a. All 3 get enough daily exercise
$p=0.27^3=0.020$
b. At least 1 of the 3 gets enough exercise
P(1)=$0,27\times(1-0.27)^2=0.144$
P(2)=$0,27^2\times(1-0.27)=0.053$
P(3)=0.020
Total $p=0.144+0.053+0.020=0.217$
