An Analysis of the Grades on the First Test in History

question 44

Multiple Choice

An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10% of the test grades. To the nearest percent,what is the dividing point between an A and a B grade?

• A)80
• B)85
• C)90
• D)95

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Definitions:

Hypothalamus

A region of the brain below the thalamus that coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, hunger, thirst, fatigue, sleep, and circadian cycles.

Limbic System

A complex system of nerves and networks in the brain, involving several areas near the edge of the cortex concerned with instinct and mood. It controls the basic emotions (fear, pleasure, anger) and drives (hunger, sex, dominance, care of offspring).

Cerebellum

The part of the brain located at the back of the skull, beneath the occipital lobes, involved in regulating motor movements, maintaining posture and balance, and possibly cognitive functions.

Cerebral Cortex

The outer layer of neural tissue of the cerebrum of the brain, playing a key role in memory, attention, perception, cognition, awareness, thought, language, and consciousness.