There Are 10 Rolls of Film in a Box and 3

question 83

Multiple Choice

There are 10 rolls of film in a box and 3 are defective. Two rolls are selected without replacement. What is the probability of selecting a defective roll followed by another defective roll?

• A) ½ or 0.50
• B) ¼ or 0.25
• C) 1/120 or about 0.0083
• D) 1/15 or about 0.07

---

Definitions:

Canal of Schlemm

A circular channel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream.

Aqueous Humor

A clear fluid found in the eye, between the cornea and the lens, that helps maintain pressure and nourishes the cornea and lens.

Depth of Focus

The range within which an image can be moved away from or closer to a lens without significantly affecting its sharpness.

Accommodation

Ability of electrically excitable tissues, such as nerve or muscle cells, to adjust to a constant stimulus so that the magnitude of the local potential decreases through time; also called adaptation.