The weighted mean if the quizzes each count for 20% and the final exam counts for 40% of the final grade rounded to one decimal place is <u>18.8</u>
Mean is the average set of numbers.
Given the Elaine quiz grades to be 90, 83 and 64
40% of the final grade will be expressed as:
20% of 90 = 18
20% of 83 = 16.6
20% of 64 = 12.8
If the quiz count for 40% of the final grade, then her final grade will be:
40% of 69 = 27.6
Take the weighted mean
Mean = Sum of scores/Sample size
Mean = (18+16.6+12.8+27.6)/4
Mean = 75/5
Mean = 18.75
Hence the weighted mean if the quizzes each count for 20% and the final exam counts for 40% of the final grade rounded to one decimal place is 18.8
Learn more here: brainly.com/question/23035749
Answer:
50
Step-by-step explanation:
a pentagon has a total of 540 degrees
105, 115, 110, 180-2x, 180-3x are the interior angles (subtract each from 180 because they're on lines)
540= 105+115+110+(180-2x)+(180-3x)
540=330 +(180-2x)+(180-3x)
210=360-5x
-150=-5x
50=x
X=6
Explanation: 6(x-4)-4=8
Multiply 6 by x and 4 to get (6x-24)-4=8
-24-4=-28, therefore, 6x-28=8
Add 28 to each side +28 +28
..To get 6x=36. Divide each side by 6...
x=6
GCF = 3
15y/3 = 5y; 6/3 = 2
Answer = 3(5y + 2)