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Formula Sheet for Test 3

Formula Sheet for Test 3 - Formula Card for Chapters Five...

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Formula Card for Chapters Five and Six For Problems Dealing With the Normal Distribution (they say normally distributed in the directions…) There are three cases 1. Directions say: Find the probability of randomly selecting a … - Draw the bell curve, label the mean, and standard deviation - Put a Z number line and an X number line at the bottom of the curve - Shade the desired area that you are looking for - Convert your x – score into a z-score using X Z μ σ - = - Look your z-score up on the table from the book (that is the area from your z- score to the mean on the curve) - If necessary perform the arithmetic needed to get your desired area 2. Directions say: Find the probability of randomly selecting n …that have an average … - Draw the bell curve, label the mean, and standard deviation **do not forget that for this problem the stan. dev. becomes X n σ σ = - Put a Z number line and an X number line at the bottom of the curve - Shade the desired area that you are looking for - Convert your X

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