2. Please find the following: X-BAR (sample mean), b. "S" (sample standard deviation, +/- 1, 2 and 3 standard deviations) and c. "S-squared" (sample variance). d. Show all heading, formulas and column headings Draw the bell curve and show X-Bar and +/- 1, 2 and 3 standard deviations on the bell a. e. curve drawing. Grouped Data f 30-39 7 40-49 60-69 3 70-79 9. 80-89 12 90-99 16 100-109 20 Totals or Sums 6,

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