Solve the Problem $$\frac { n } { \sum ( 1 / x ) }$$

question 178

Multiple Choice

Solve the problem.
-The harmonic mean is often used as a measure of center for data sets consisting of rates of change, such as speeds. It is found by dividing the number of values (n) by the sum of the reciprocals of all values, expressed as $$\frac { n } { \sum ( 1 / x ) }$$ Pierre drives to work (a distance of 54 miles) at a speed of 74 mph and returns home at a speed of 53 mph. What
Is his average speed for the round trip? Use the harmonic mean.

• A) 61.8 mph
• B) 63.6 mph
• C) 63.5 mph
• D) 62.6 mph

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Definitions:

Chromatin

The complex of DNA and histone proteins that forms chromosomes within the nucleus of eukaryotic cells, regulating gene expression.

Membrane Potential

The voltage difference across a cell's membrane, crucial for the function of excitable cells like neurons and muscle cells.

Extracellular Glycocalyx

A complex carbohydrate-rich layer that coats the outer surface of cells, playing key roles in cell-cell interactions and protection.

Transcription

The process by which the genetic information in DNA is copied to RNA, leading to protein synthesis.