DSCI 2710 3rd Edition Lecture 3Outline of Last Lecture I. Frequency DistributionOutline of Current Lecture II. Descriptive graphsIII. Measures of Central TendencyIV. Meana. Medianb. Modec. Ranged. Mid-rangeV. Standard DeviationCurrent LectureDescriptive graphsbell curven= sampleN= population Measures of Central Tendency- Determine the center of your data values or possibly the most typical data value- Variation: will not always be a normal curveThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Position: will not always be in the same spot, can be skewedMean- The average numberData: 5,6,7,9,23(5+6+7 +7+23)/5 = 10 x= (Σ xἰ) nMedian- Middle number (50th percentile)- Md= (n+1)/2Mode- m₀= most frequent observationMidrangemr= (L+H)/ 2RangeR= H (highest) – L (lowest)Standard DeviationStd. Dev. = √variations²=(Σx²- ∑ x²/n)/n-1variance =