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Elan Coil [88]
3 years ago
7

Vikki wants to determine whether students in her school would rather attend sporting event or a concert. Which would be the BEST

method for Vikki to produce a representative sample?
A. Randomly survey 50 students from each of the three grades at her school

B. Randomly survey 20 students from each of the three grades at her school

C. Randomly survey 50 students from her grade at her school

D. Randomly survey 50 students at her school
Mathematics
2 answers:
nevsk [136]3 years ago
7 0
Most likely ill go with D.
bija089 [108]3 years ago
3 0
B . in that way , she'd get a variety of age groups and stuff
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Answer:

1) The probability that the mean mpg for a random sample of 25 light vehicles is 0.042341.

2) between 20 and 25 --> 21-25/2.9 = -1.38

Step-by-step explanation:

Problem #1:

  • Using the z-score formula, z = (x-μ)/σ/n, where x is the raw score = 20 mpg,μ is the population mean = 21 mpg , σ is the population standard deviation = 2.9, n = random number of samples.
<h3><u>X < 20</u></h3>
  • = z = 20 - 21/2.9/√25
  • = z = -1/2.9/5
  • = z = -1.72414
<h2><u><em>Now</em></u></h2>

<em>P-value from Z-Table:</em>

<h3><u>P(x<20) = 0.042341</u></h3>

Problem #2:

<h3>21-25/2.9 = -1.38</h3>
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Hope this helps!!!! :)

**(Bojana)**

Step-by-step explanation:

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