Solving Statistic Problem: Low Tire Pressure & Tread Depth

[inchuljang]

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...

 

[Astronuc]

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.

 

[EnumaElish]

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?