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.
- 10 months 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