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Contact [7]
3 years ago
8

Below are the data collected from two random samples of 500 American students on the number of hours they spend in school per da

y (rounded to the nearest hour): Number of hours in school per day 4 5 6 7 8 Sample A: Number of students 70 100 125 135 70 Sample B: Number of students 80 90 120 125 85 Meg concludes that students spend a mean of 7 hours in school each day. Tara thinks the mean is 6 hours. Who is correct Meg or Tara? Explain your answer in two or three sentences.
Mathematics
1 answer:
balu736 [363]3 years ago
3 0

Answer: <em>Tara thinks correctly.</em>

Step-by-step explanation:

<em>Let's calculate the average value in sample A:</em>

<em>(4 × 70 + 5 × 100 + 6 × 125 + 7 × 135 + 8 × 70) ÷ 500 = 6,07 ≈ </em><em>6 hours</em>

<em>Let's calculate the average value in sample B:</em>

<em>(4 × 80 + 5 × 90 + 6 × 120 + 7 × 125 + 8 × 85) ÷ 500 = 6,09 ≈ </em><em>6 hours</em>

<em>So, Tara is correct in saying that the mean is 6.</em>

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-9 more than a number results in -20
damaskus [11]

Answer:

-9+x=-20

Step-by-step explanation:

I am not so positive on this one, but if you are not doing inequalities, then this should be correct.

"More than" would insinuate that you are adding. In this class, you would have a number to replace that x, but since no number was given, you place the x in its place. x=-11, because when you "add" -9 with something to get -20, it would have to be -11. Negative numbers can be confusing because when you subtract a negative number by another negative, you end up with a negative. Like in this case. Normally, you would just put -11, so it would look like -9 - 11 = -20. But since this says "more than", unless you are doing inequalities, you add.

If you are doing inequalities, then your answer should be this:

-9 > x = -20

I hope this helps!

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4 0
2 years ago
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Drupady [299]

Answer: C

Step-by-step explanation: Hope it helped :)

8 0
3 years ago
Help me with math please.
djverab [1.8K]
The answer to that will C and that is easy
3 0
2 years ago
Which fraction is equivalent to 4/-9 ?<br><br> A) -4/9 <br> B) 4/9 <br> C) -4/-9 <br> D) 9/4
Art [367]
The answer is A  hope this helps

4 0
3 years ago
Read 2 more answers
Jordan has $55.She earns 67 by doing chores. How much money does Jordan have now ?
rosijanka [135]
Add the values, then you get the answer. 

55+67 = ?

    55
 + 67
------------
   122


Final answer: $122 is how much Jordan has.


5 0
3 years ago
Read 2 more answers
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