AVERAGES How to calculate And… Some Surprises!. How to Average Scores Add the total of all the scores Divide by the number of scores you have. That result.

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Presentation transcript:

AVERAGES How to calculate And… Some Surprises!

How to Average Scores Add the total of all the scores Divide by the number of scores you have. That result is the average, also known as the mean.

Average Andy’s Scores: 70

Average Bob’s Scores:

Average Chuck’s Scores: 70 0

Average Dave’s Scores: 70 0

Poor Dave! With 10 scores, he has a 56! How many “hundreds” does he need to bring his average back up to 70? Two? Four? More? If Dave scores a 100 on each of the next five assignments, then his total average is 70.7 ! Wow… It takes five HUNDREDS to cancel out only 2 zeros if his average was a 70. WHAT DOES THIS TELL YOU ?!?!?!?

CONCLUSIONS? Each 100 will bring up your average…but not as much a ZERO brings it down! Two zeros bring it waaaaaaaay down! What if you have several zeros… Your average? Time is shorter than you think! Don’t fall behind!

Nine-Weeks Grade CW 30% HW 10% T 60% CW = 80 HW = 100 T = 50 Grade = ?.3 × × × 50 = = 64 Pass “D” Find Grade: CW 70 HW 50 T 60.3 × × × 60 = = 62 Pass “D”

Nine-Weeks Grade CW 30% HW 10% Test 60% Grade? CW 60 HW 0 Test 70.3 × × × 70 = = 60 “D” Pass… but close! Grade? CW 70 HW 0 Test 60.3 × × × 60 = = 57 Uh-oh!!! Not enough!! Conclusions?

FINAL AVERAGE: Each semester counts half of your course grade. Add ‘em up, divide by two. Within each semester, each nine weeks counts 45% and a midterm (first semester) or final (second semester) counts 10%. DANGER: If you goof around during the first semester, you’ll have to work twice as hard the second semester… or, if you’ve really botched things… it may not matter!

Calculate Final Average 1 st 9 ws: 722 nd 9 wks: 58 Midterm: × ( ) +.1 × 64 = 64.9 (which is really a 65) 3 rd 9 wks: 524 th 9 wks: 60 Final: × ( ) +.1 × 48 = 55.2 Total: ( ) ÷ 2 = 60 ( ) ÷ 2 = 62.5 (may round to 63) Whew! Passing… but just barely!

Calculate Final Average 1 st 9 ws: 522 nd 9 wks: 58 Midterm: × ( ) +.1 × 54 = 54.9 (STI should round to 55?) 3 rd 9 wks: 624 th 9 wks: 60 Final: × ( ) +.1 × 96 = 64.5 With rounding, ( ) ÷ 2 = 60. BUT… Look at that final exam grade! Anything less than a 96… student does NOT pass!

CONCLUSIONS? DO THE WORK AND TURN IT IN! ZEROs will KILL your grade! Don’t Fall Behind! Re-take a test, if you need to, to bring up your grade-point average! Get help when you need it! (I’m here every morning and afternoon.)