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Anettt [7]
2 years ago
9

Christian randomly selects students from his grade to rate a math test as easy, moderate, or difficult. Of the students he surve

yed, 13 said the test was easy, 11 rated it as moderate, and 3 found it difficult. Assuming that all students took the same test, how many of the 162 total students in Christian’s grade would probably rate the test something other than easy?
A.
27
B.
78
C.
84
D.
126
Mathematics
1 answer:
Paraphin [41]2 years ago
8 0

Answer:

C.

84

Step-by-step explanation:

This question is solved using proportions.

From the sample:

11 + 3 = 14 out of 13 + 11 + 3 = 27 would rate the test something other than easy.

Out of 162:

Applying the rule of three:

14 - 27

x - 162

Applying cross multiplication:

27x = 14*162

x = \frac{14*162}{27}

x = 84

Thus the correct answer is given by option C.

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Alan needs to manufacture a circular metal plate with a perimeter of `10pi` centimeters. If the allowed error tolerance in the p
AnnZ [28]

The ideal radius Alan must control is \frac{1}{2\pi } cm.

<h3>Define perimeter of circle.</h3>

The measurement of the circle's perimeter, also known as its circumference, is called the circle's boundary. The area of a circle determines the space it takes up. A circle's diameter is equal to the length of a straight line traced through its center. Usually, it is stated in terms of units like cm or m.

Given data -

Perimeter of circular plate = 10\pi cm

We know that perimeter of a circle is 2\pir

Therefore   10\pi = 2\pir

r = 5 cm

The given error Alan can make is +-1 cm.

Minimum radius is given by

2\pir = 10\pi - 1

r = \frac{10\pi - 1 }{2\pi }

r = 5 - \frac{1}{2\pi }

Maximum radius is given by

2\pir = 10\pi + 1

r = \frac{10\pi + 1 }{2\pi }

r = 5 + \frac{1}{2\pi }

The ideal radius Alan must control is \frac{1}{2\pi } cm.

To know more about perimeter of circle, visit:

brainly.com/question/2718232

#SPJ1

5 0
1 year ago
this year the winner of the New York Marathon ran the 8 km event in 24 minutes what is the runners unit rate
yan [13]
1 km every 3 minutes
7 0
3 years ago
To eliminate the x terms and solve for y in the fewest steps, by which constants should the equations be multiplied by before ad
ludmilkaskok [199]

Answer:

its c

Step-by-step explanation:

bro bro if anyone did that's stuff laugh at them and move on with ur life dont let people like them ruin your motivation to move forward there the type of toxic people to hold u back but like i said the girls got u bro

5 0
3 years ago
Read 2 more answers
Hi! Can someone please help me with this math problem? Please show your work on how you got your answer. Thank you!
SVEN [57.7K]

Answer:

5=p

Step-by-step explanation:

18=3.50+2.75P

18-3.50=2.75p

14.5/2.75=2.75p/2.75


5=p

she can buy 5 popcorn

5 0
2 years ago
Smooth, suave, ingratiatingly pleasant
mash [69]
I say the answer is B. Bland

4 0
3 years ago
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