Discrete statistics

Example: Final Exam Scores

Data Set: upload your own, use spaces to seperate.

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Range for Graph:

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Probabilty can be found using a Z-score. You need the Chart.

Example: What is the score if you want to find the Probabilty of getting 75% or higher.

First you must find the z-score.

Formula: (x - µ) / σ

x = 75

In this Example the Z-Score is 1.1674502429969722. we round to 1.16 and go to the Chart.

Scroll down until you see the Table, ignore the bars. Find 1.16 on the table, in this case 0.87698 is what we get...

However, that is not our probability. Remember, a lot of people did bad on this test. The top 87% scored 75 or higher.

So we subtract 0.87698 from 1 => 1 - 0.87698 = 0.13 or 13% chance to score 75 or higher and 87% chance to score lower than 75

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