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Calculating Normal Curve

Percentiles on the TI-84

These instructions will

work for the TI-83 and

TI-84 families of

calculators.

Read the problem carefully:

We have a national examination given to a

large group of students and we know the

data is normally distributed. The average for

the data is 300 with a standard deviation of

50. What is the percentile score of someone

who earns 215 on the exam?

Identify the average (300), the standard

deviation (50), and the raw score (215).

What is bell curve percentages? Bell curve percentages are various values that are used in the plotting of a density curve to represent a normal distribution in a histogram. The percentages obeyed by all bell curves are 68, 95 and 99.7. The curves are always above the axis. Each of the percentages in the curve represents a given range of values.

Title: Slide 1

Author: Camille

Creator: Microsoft® Office PowerPoint® 2007

Producer: Microsoft® Office PowerPoint® 2007

CreationDate: Sat Aug 22 20:32:14 2009

ModDate: Mon May 9 15:10:55 2011

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