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butalik [34]
3 years ago
6

4) Elaine gets quiz grades of 90, 83, and 64. She gets a 69 on her final exam. Find the weighted mean if the quizzes each count

for 20% and the final exam counts for 40% of the final grade. Round to one decimal place
Mathematics
1 answer:
Natasha2012 [34]3 years ago
6 0

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

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adelina 88 [10]

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the correct answer is B. 5 miles per hour

Step-by-step explanation:

if she walks 5 miles in a hour she can walk 2.5 miles in 30 minutes

8 0
3 years ago
Given: is an angle bisector of ∠JMK<br><br><br>Prove: m
astraxan [27]

Answer:

An angle bisector is a line passing through the vertex of the angle that cuts the angle into two equal smaller angles.

Given: MN is angle bisector,

then  

\angle JMN \cong \angle NMK            .......  [1]

Congruent angles are  two or more angles that have the same measure.

then;

by definition of congruent angles

[1]⇒ m\angle JMN = m\angle NMK                ......[2]

By the  Angle addition postulates states that if M is in the interior of ∠JMK then,

m\angle JMN+m\angle NMK =m\angle JMK            ......[3]

Now, by substitution property ; substitute the equation [2] in [3] we get;

m\angle JMN+m\angle JMN =m\angle JMK                 ......[4]

Like terms terms whose variables  are the same

Combine like terms in equation [4] we get

2 \cdot m\angle JMN=m\angle JMK                      ......[5]

Division property of equality states that you divide the same number to both sides of an equation.

Divide by 2 to both sides in equation [5] , we get

m\angle JMN= \frac{1}{2} m\angle JMK    


5 0
3 years ago
The sum of two numbers is 31.5. The difference is 5.25. Find the numbers
ANTONII [103]
X+y=31.5
x-y=5.25

add 2 equations
x+y+x-y=31.5+5.25
2x=36.75
x=18.375
y=31.5-18.375=13.125
check : 18.375+13.125=31.5, 
18.375-13.125=5.25 
so
Answer:
18.375 and 13.125

8 0
4 years ago
Read 2 more answers
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Leto [7]

Answer:

D) 12

Step-by-step explanation:

divide each term by -8 and simplify

-8/-8x=-96/-8

x=12

7 0
3 years ago
Read 2 more answers
What is the value of x
Afina-wow [57]

Answer:

4

Step-by-step explanation:

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Sin 30 = ½

LJ = 4sqrt(2)

LM = JM = x

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x = 4

6 0
4 years ago
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