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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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The Sandbox must be 19x19 for the area to be 361.

Step-by-step explanation:

(19x19=361)

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Solve for x. Round your answer to the nearest tenth. Will brainlist first correct
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Step-by-step explanation:

Using the cosine ratio in the right triangle

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3 years ago
An angle whose measure is 405° is in standard position. In what quadrant does the terminal side of the angle fall?
katrin2010 [14]

Answer:

The angle is in the first quadrant

Step-by-step explanation:

For angles greate than360°,subtract

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. In RST, R is 20° more than two times S, and S = T. Find the<br>measure of each angle. -​
ziro4ka [17]

∠R = 100° , ∠S = 40° and ∠T = 40°

<u>Step-by-step explanation:</u>

In a triangle, sum of all the angles in a triangle is equal to 180 degrees.

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<u></u>

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4 years ago
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