A house installed an automatic water$-$saving sprinkler which monitors weather $($r: rain or not$)$ to turn the sprinkler on or off $($s: on or off$).$ This forms a Bayesian network shown in Figure $4$ with three random variables:

r: $1/0$ denoting raining $($r$=1)$ or not $($r$=0).$

s: $1/0$ denoting sprinkler is on $($s$=1)$ or off $($s$=0).$

w: $1/0$ denoting lawn is wet $($w$=1)$ or dry $($w$=0).$

In the past, the house owner has observed following probability values: