In a Certain Population, Body Weights Are Normally Distributed with a Mean

question 97

Multiple Choice

In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error
Is no more than 2.5 percentage points.

• A) 1682
• B) 591
• C) 1281
• D) 811

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Definitions:

Nucleosomes

Nucleosomes are the basic structural unit of DNA packaging in eukaryotic cells, composed of a segment of DNA wound around a core of histone proteins.

Histones

Small, positively charged (basic) proteins in the cell nucleus that bind to the negatively charged DNA. See nucleosomes.

Somatic Cell

In animals, a cell of the body not involved in formation of gametes. Compare with germ line cell.

Interphase

The stage of the cell cycle between successive mitotic divisions; its subdivisions are the G-22 / Glossary phases.