A Multiple-Choice Test Consists of Ten Questions, Each with A-E

question 88

Multiple Choice

A multiple-choice test consists of ten questions, each with A-E answers. If you guess the answer to
Each question, how many questions can you expect to get correct? Also find the standard deviation
Of the number of questions you can expect to get correct.

• A) 1, 1.6
• B) 3, 1.3
• C) 2, 1.3
• D) 1.2, 1.6

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Definitions:

Atmospheric Oxygen

The oxygen gas (O2) present in the Earth's atmosphere, essential for the respiratory processes of most living organisms.

Photosynthesizing Bacteria

Microorganisms that convert light energy into chemical energy through the process of photosynthesis.

Terrestrial Plants

Plants that grow on land, as opposed to aquatic (water-based) or epiphytic (growing on other plants) plants.

Primitive Atmosphere

The early atmosphere of Earth, which was very different in composition from the current one, possibly composed of gases such as methane, ammonia, and water vapor.