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kati45 [8]
3 years ago
12

Please help with these questions!! Tysm!

Mathematics
2 answers:
Dmitrij [34]3 years ago
7 0
Answer:
1.
2. 6 + 3 * y
3. Is 12w + 12z
11111nata11111 [884]3 years ago
3 0
1.) 2w+6z
2.) 3x+6
3.) 3x-y+3
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Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students
Nezavi [6.7K]

Answer: A. 85.7

Step-by-step explanation:

Given : Two sections of a class took the same quiz.

Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90.

We know that  , \text{Mean}=\dfrac{\text{Sum of observations}}{\text{No. of observations}}

Then , for section A :

\text{Mean score }=\dfrac{\text{Sum of scores in sec A}}{\text{No. of students}}

\Rightarrow\ 80=\dfrac{\text{Sum of scores in sec A}}{15}\\\\\Rightarrow\ \text{Sum of scores in sec A}=80\times15=1200

Similarly in Section B, \text{Sum of scores in sec B}=90\times20=1800

Total scores = Sum of scores in sec A+Sum of scores in sec B

=1200+1800=3000

Total students = Students in sec A +Students in sec B

=15+20=35

Now , the mean score for all of the students on the quiz =\dfrac{\text{Total score}}{\text{Total students}}

=\dfrac{3000}{35}=85.7142857143\approx85.7

Hence, the approximate mean score for all of the students on the quiz = 85.7

Thus , the correct answer is option A. 85.7.

7 0
3 years ago
Find the area of the figure below​
horrorfan [7]

Answer:

99cm^{2}

Step-by-step explanation:

12x4=48

12x3=36

12-4-5=3

3x5=15

48+36+15=99

5 0
2 years ago
The first quartile of a data set is 31, and the third quartile is 47. Which of these values in the data set is an outlier?
o-na [289]
The answer to this is D
4 0
3 years ago
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4 teammates share 5 granola bars equally. How much of a bar dows each person get?
worty [1.4K]
So it would be 5 divided by four. You cannot do that, so the closest number you could get to is 4. Which means each teammate gets 1 granola bar. The sentence for that would be: 5 divided by 4 = 1 remainder 1.
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3 years ago
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What is the value of x and y
ASHA 777 [7]

Answer:

x=55 y=70

Step-by-step explanation:

6 0
3 years ago
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