Solving Statistic Problem: Low Tire Pressure & Tread Depth

  • Thread starter Thread starter inchuljang
  • Start date Start date
  • Tags Tags
    Statistic
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
Sign up Log in
2 replies · 2K views
inchuljang
Messages
1
Reaction score
0

Homework Statement



when checking tire tread depth at an automobile repair ship, it has been determined that if a tire has low air pressure, there is a 22% probability that its tread depth is less than 1/8 of an inch. on a given day 75 out of 100 tires were found to have a tread depth greater than 1/8 of an inch. how many tiras had low air pressure?

Homework Equations





The Attempt at a Solution



thank for the help...
 

Discussion

Physics news on Phys.org
75 out of 100 tires were found to have a tread depth greater than 1/8 of an inch
So 25 tires had less than 1/8 of an inch, and clearly they have low pressure.

Then "22% probability that its tread depth is less than 1/8 of an inch" of the population of low pressure tires.
 
inchuljang said:

Homework Statement



when checking tire tread depth at an automobile repair ship, it has been determined that if a tire has low air pressure, there is a 22% probability that its tread depth is less than 1/8 of an inch. on a given day 75 out of 100 tires were found to have a tread depth greater than 1/8 of an inch. how many tiras had low air pressure?

Homework Equations





The Attempt at a Solution



thank for the help...
This seems like a conditional probability question. Have you had any thoughts on the problem?