Use the 68-95-99.7 Rule to Solve the Problem

question 245

Multiple Choice

Use the 68-95-99.7 rule to solve the problem.
-Scores on a test are normally distributed with a mean of 101 and a standard deviation of 20. What percentage of scores are greater than 161?

• A)99.85%
• B)99.7%
• C)0.3%
• D)0.15%

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Definitions:

Synchronous Motor

A type of AC motor that operates at a speed directly proportional to the frequency of the current supply.

Power Factor Correction

Adding capacitance or inductance to a circuit to cause the current and voltage to become more in phase with each other.

Synchronous Condenser

A term used to describe a synchronous motor that is used to provide power factor correction.

Synchronous Speed

The speed at which the magnetic field in an AC machine rotates, typically in motors or generators, determined by the machine's electrical frequency and the number of magnetic poles.