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Decision Tree
Decision Theory
A finance manager is considering drilling a well. In the past, only 70% of
wells drilled were successful at 20 metres depth in that area. Moreover, on
finding no water at 20 metres, some persons in that area drilled in further
up to 25 metres but only 20% struck water at that level. The prevailing cost
of drilling is Rs.500 per metre. The finance manager estimated that in case
he does not get water in his own well, he will have to pay Rs.15000 to buy
water from outside for the same period of getting water from the well. The
following decisions are considered:
i. Do not drill the well,
ii. Drill up to 20 metres, and
iii. If no water is found at 20 metres, drill further up to 25 metres.
Draw an appropriate decision tree and determine the finance manager’s
optimum strategy.
17/12/2018Anurag Srivastava 2
Decision Tree
D1
C1
D2
C2
do not drill
drill up to 20m
water found
no water found
do not drill
drill up to 25m
water found
no water found
p = 0.7
p = 0.3
p = 0.2
p = 0.8
-15000
-15000
-17500
-2500
-10000
17/12/2018Anurag Srivastava 4
Roll-Back
D1
C1
D2
C2
do not drill
drill up to 20m
water found
no water found
do not drill
drill up to 25m
water found
no water found
p = 0.7
p = 0.3
p = 0.2
p = 0.8
-15000
-15000
-17500
-2500
-10000
-14500
-11350
17/12/2018Anurag Srivastava 6
𝑨𝒏𝒔: 𝑫𝒓𝒊𝒍𝒍 𝒖𝒑𝒕𝒐 𝟐𝟎𝒎, 𝒊𝒇 𝒏𝒐 𝒘𝒂𝒕𝒆𝒓, 𝒅𝒓𝒊𝒍𝒍 𝒖𝒑𝒕𝒐 𝟐𝟓𝒎. 𝑬𝒙𝒑𝒆𝒄𝒕𝒆𝒅 𝒄𝒐𝒔𝒕: 𝑹𝒔. 𝟏𝟏𝟑𝟓𝟎
17/12/2018Anurag Srivastava 7

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Decision tree solved

  • 2. A finance manager is considering drilling a well. In the past, only 70% of wells drilled were successful at 20 metres depth in that area. Moreover, on finding no water at 20 metres, some persons in that area drilled in further up to 25 metres but only 20% struck water at that level. The prevailing cost of drilling is Rs.500 per metre. The finance manager estimated that in case he does not get water in his own well, he will have to pay Rs.15000 to buy water from outside for the same period of getting water from the well. The following decisions are considered: i. Do not drill the well, ii. Drill up to 20 metres, and iii. If no water is found at 20 metres, drill further up to 25 metres. Draw an appropriate decision tree and determine the finance manager’s optimum strategy. 17/12/2018Anurag Srivastava 2
  • 4. D1 C1 D2 C2 do not drill drill up to 20m water found no water found do not drill drill up to 25m water found no water found p = 0.7 p = 0.3 p = 0.2 p = 0.8 -15000 -15000 -17500 -2500 -10000 17/12/2018Anurag Srivastava 4
  • 6. D1 C1 D2 C2 do not drill drill up to 20m water found no water found do not drill drill up to 25m water found no water found p = 0.7 p = 0.3 p = 0.2 p = 0.8 -15000 -15000 -17500 -2500 -10000 -14500 -11350 17/12/2018Anurag Srivastava 6
  • 7. 𝑨𝒏𝒔: 𝑫𝒓𝒊𝒍𝒍 𝒖𝒑𝒕𝒐 𝟐𝟎𝒎, 𝒊𝒇 𝒏𝒐 𝒘𝒂𝒕𝒆𝒓, 𝒅𝒓𝒊𝒍𝒍 𝒖𝒑𝒕𝒐 𝟐𝟓𝒎. 𝑬𝒙𝒑𝒆𝒄𝒕𝒆𝒅 𝒄𝒐𝒔𝒕: 𝑹𝒔. 𝟏𝟏𝟑𝟓𝟎 17/12/2018Anurag Srivastava 7