Transcript Median
Lesson # 23 MEDIAN Pay Close Attention ! The “Median”… Of a group of numbers Is… The “center or middle” value … Creating an equal number of values on either side of it. However… All the values or numbers must be arranged in order from smallest to biggest First ! Like …the number 10 is the “median” in the set … 3, 6, 10, 12, 15 Or the number 15 is the median in this set… 8,9,10,11, 15, 21, 22, 24, 25 See… There are 4 values on either side of the 15! But what would happen if there was an even set of values… Meaning… there was no “exact” middle??? Hmmm… Like the “median” of this set… 3, 5, 8, and 9. ??? What to do ? Rather than guess… Watch ! Quietly! And LEARN ! Here is what to do… 3, 5, 8, 9 Take the 2 center values (5,8) And find their “Mean” Huh? That’s right… Find the “mean” of the 2 center values. (5 and 8) And that means… Add them and then divide by 2 Soooooo… 5 + 8 = 13…divided by 2 equals 6.5 ! Yep…the Median of 3,5,8,9 Is… 6.5………… Yahoo ! Remember… You only need to do this calculation if there is an “even” set of values! Get it ? Good, you got it… Now you are ready for 10 Practice questions! Find the “Median” of … The next 10 Groups of numbers. Question # 1 7, 8, 9, 10, 11 Question # 2 12, 13, 17, 20 Question # 3 6, 11, 15, 21, 27 Question # 4 11, 22, 33, 44 Question # 5 40, 50, 55, 60, 70 Question # 6 10, 4, 8, 6 Question # 7 25, 15, 20 Question # 8 2.5, 1.5, 3.5, 4.5 Question # 9 11.2, 12.0, 12.4, 11.8, 10.9 Question # 10 1/6, 1/3, 2/3, 5/6 And now the answers. Prepare Yourself ! Question # 1 7, 8, 9, 10, 11 9 Question # 2 12, 13, 17, 20 15 Question # 3 6, 11,15, 21, 27 15 Question # 4 11, 22, 33, 44 27.5 Question # 5 40, 50, 55, 60, 70 55 Question # 6 10, 4, 8, 6 7 Question # 7 25, 15, 20 20 Question # 8 2.5, 1.5, 3.5, 4.5 3 Question # 9 11.2, 12.0, 12.4, 11.8, 10.9 11.8 Question # 10 1/6, 1/3, 2/3, 5/6 ½ or 3/6 Almost… The End Remember… People do not wake up one morning and know how to play A Guitar! It takes Practice! Now… The End