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Vinil7 [7]
2 years ago
9

115 students could sign up to hear three different speakers for career day. 70 students heard the nurse speak, 52 heard the fire

fighter, and 78 heard the webmaster. Some students heard more than one speaker. The results are shown in the table below.
___________________________________
Number of students | Speaker
15 | All three
20 | Nurse and firefighter
30 | Webmaster and nurse
12 | Firefighter only

How many students signed up for Webmaster only?
Mathematics
1 answer:
Crank2 years ago
4 0
I think it is 28 but, i'm not completely sure. Hopes it helps
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In a random sample of 200 cars of a particular model,
Aleks04 [339]

By using proportions, We expect 150 defects out of the 10,000 cars if the 3 defects out of the 200 cars sampled is representative of all 10,000 cars.

Option A is correct.

First, let's set up the proportions.

A proportion is an equation in which two ratios are set equal to each other.

We have 3/200 cars with defects and we want to know X for X/10000.

So 3/200 = X/10000

Now solve for X.

3/200 = X/10000

X = \frac{3}{200} \times 10000

X = 150

So the answer is: We expect 150 defects out of the 10,000 cars if the 3 defects out of the 200 cars sampled is representative of all 10,000 cars.

Option A is correct.

Find out more information about proportions here

brainly.com/question/11609816

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8 0
2 years ago
Water is flowing at the rate of 15 km/hr through a pipe of diameter 14 cm into a cuboidal pond
tatyana61 [14]
2 hours.

hope this helped
7 0
3 years ago
Simplify.<br>Enter your answer, in simplest form, (in the boxes).
zepelin [54]

Answer:

1/4

Step-by-step explanation:


5 0
3 years ago
Estigation -Grade 12
zloy xaker [14]

Answer:

i don't know this type of work.

Step-by-step explanation:

i'm only in 10th grade

7 0
3 years ago
How to solve this problem??
slega [8]
\frac{2}{3} =  \frac{18}{x+5}&#10;
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multiply each side by 3

8 0
3 years ago
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