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2 years ago

Which of the following is a random sample?

Mathematics

1 answer:

slavikrds [6]2 years ago

6 0

Answer:

Step-by-step explanation:

A. City voters were asked about candidates. That seems to be random.

B. A survey about singers took place at a specific concert. Naturally, the people who are there like this singer. It is not random.

C. Customers were asked about food at a pizza shop. Naturally, they like pizza. This is not random.

D. An email survey was sent. Mostly people who own computers will respond. This is not random.

Answer: A.

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In a test (+5) marks are given for every correct answer and (-2) marks are given for every incorrect answer . Roy answered all t

katovenus [111]

Answer:

20 questions

Step-by-step explanation:

Given

$Correct \Marks= +5$

$Incorrect\ Marks= -2$

$Score\ Obtained = 30$

$Number\ of\ correct\ answers = 10$

Required

Number of questions answered

First, we need to get the total correct marks obtained by Roy

This is calculated by multiplying the correct marks by number of correct answers

$Total = +5 * 10$

$Total = +50\ marks$

Subtract this from the total scores obtained; This gives the total incorrect answer obtained by Roy

$Incorrect = Scores\ Obtained - Total$

$Incorrect = 30 - (+50)$

Open bracket

$Incorrect = 30 - 50$

$Incorrect = -20$

Divide this by -2 to get the number of incorrect answers

$Incorrect\ Answers = \frac{-20}{-2}$

$Incorrect\ Answers = 10$

Add this to the number of correct answers to give the total number of question answered

$Total = Correct\ Answers + Incorrect\ Answers$

$Total = 10 + 10$

$Total = 20$

<em>Hence, Roy answered a total of 20 questions</em>

3 0

3 years ago

Which number produces an irrational number when added to 0.5?

Andru [333]

It would be the square root of 3

5 0

3 years ago

Mike wants to make meatloaf. His recipe uses a total of 7 pounds of meat. If he uses a 3 to 1 ratio of beef to pork, how much po

SSSSS [86.1K]

Total meat in the recipe he wants to use = 7 pounds

Beef : pork = 3 : 1

Total pork that he will use = $\frac{1}{3+1}$ x 7 pounds

= 7/4 pounds

hope this helps

6 0

2 years ago

Which of the following are properties of the circumcenter of a triangle? Check all that apply.

kakasveta [241]

Answer:

A) The circumcenter of a right triangle falls on the side opposite the right angle

B) The circumcenter is at the intersection of the perpendicular bisectors of the triangle's sides

D.) The circumcenter is equidistant from (Apex)

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

If something is $380, then the sellers mark up the price by 84%, what is the final sale price??

nadya68 [22]

699.2 is correct answer

4 0

2 years ago