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# A) Construct a tree diagram to show the possibilities of needing new brake pads and brake discs.?

At its 40,000-mile service, the probability of a car needing new brake pads is 0.3. If it does need brake pads, the probability of it also needing new brake discs is 0.8. If not, the probability of needing brake discs is 0.3.

### 1 Answer

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- 1 month ago
In 100 cases

30 will need new brake pads

24 of those 30 will need new brake disks as well

70 will not need new brake pads

21 of those 70 will need new brake disks

49 will need neither

49 No pads, no disks

21 No pads, yes disks

6 Yes pads, no disks

24 Yes pads, Yes disks

That's out of 100 cases

0.49 NN

0.21 NY

0.06 YN

0.24 YY

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