A Frequency Distribution Has a Mean of 200 and a Standard

question 88

Multiple Choice

A frequency distribution has a mean of 200 and a standard deviation of 20. The class limits for one class are 220 up to 240. Based on the normal distribution,what is the probability that an observation would be in this class?

• A)0.1359
• B)0.3413
• C)0.4772
• D)0.8185

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Definitions:

Probability

The measure of the likelihood that an event will occur, expressed as a number between 0 and 1.

Sampling Error

Refers to the difference between the population parameter and the sample statistic due to the fact that the sample is not a perfect representation of the population.

Statistical Error

The difference between a measured or observed value and the true value, often arising from sampling or measurement limitations.

Random Factors

Variables in an experiment that are randomly varied to assess their incidental effects on the outcome, as opposed to systematically manipulated factors.