The Scores of High-School Students Sitting a Mathematics Exam Were

question 82

Short Answer

The scores of high-school students sitting a mathematics exam were normally distributed, with a mean of 86 and a standard deviation of 4.
a. What is the probability that a randomly selected student will have a score of 80 or less?
b. If there were 97 680 students with scores higher than 91, how many students took the test?

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Definitions:

Symptoms Of Mania

Behavioral and psychological features such as increased energy, euphoria, decreased need for sleep, grandiosity, and sometimes irritability, typically observed in bipolar disorder.

Positive Life Events

Occurrences or experiences that have a beneficial effect on an individual's mental and physical well-being.

Aggressiveness

A behavioral trait characterized by the propensity to initiate hostile or violent actions, often as a way of coping with stress or frustration.

Physical Activity

Any bodily movement produced by skeletal muscles that requires energy expenditure, including activities undertaken while working, playing, carrying out household chores, traveling, and engaging in recreational pursuits.