We Classify Galaxies By

question 87

Multiple Choice

We classify galaxies by:

• A) their true shapes
• B) how they appear on the sky
• C) the amount of gas and dust in them
• D) whether they are near or far from us
• E) the amount of dark matter they contain

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Definitions:

Probability Distribution

A mathematical function that calculates the probability of different possible results occurring in an experiment.

Random Variable

A variable whose possible values are numerical outcomes of a random phenomenon.

Poisson Distribution

A discrete frequency distribution which gives the probability of a number of independent events occurring in a fixed time.

Mean

The arithmetic average of a set of numbers, found by dividing the sum of all numbers by the count of numbers.