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xenn [34]
3 years ago
9

Question 18(Multiple Choice Worth 1 points) (01.01) Period 1 has 15 students in it and a test average of 86%. Period 2 has 21 st

udents in it and an average of 88%. Period 3 has 12 students in it and an average of 95%. Use weighted means to find the overall average of the classes.
Mathematics
1 answer:
andrew11 [14]3 years ago
8 0

Answer:

89.125%

Step-by-step explanation:

The weighted mean is simply the multiplication of the number of student in each period times the respective average of said period, divided by the total number of students:

Average = \frac{15* 86 + 21*88 + 12*95}{15 + 21 + 12} = 89.125%

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Yakvenalex [24]

Answer:

<u>Hence final answer is B: Step 2.</u>

Step-by-step explanation:

Step 1: Find the total points needed to score in six games: 96x6=576

Justification:

Product of 96 and 6 is 576 which is same number found by Brenda. So step 1 is correct.


Step 2: Find the total points scored: 92+110+85+78=365

Justification:

Sum of total points scored by Brenda is 92+110+85+78= 461.

But she got different value 365.

Hence step 2 is wrong.


<u>Hence final answer is B: Step 2.</u>

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3 years ago
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Kruka [31]

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Step-by-step explanation:

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3 years ago
Please someone help me I'm stuck on my homework for at least a hour
miss Akunina [59]

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Solve the equation and explain each step using apropriate Properties<br> -4(3x+6)+6=-30
Lina20 [59]

Answer:

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Step-by-step explanation:

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Elza [17]

Answer:

20 feet wide, 24 feet long

Step-by-step explanation:

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3 years ago
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