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Simora [160]
2 years ago
9

A sample of ????=25 diners at a local restaurant had a mean lunch bill of $16 with a standard deviation of ????=$4 . We obtain a

95% confidence interval as (14.43,17.57) . Which action will not reduce the margin of error?
Mathematics
1 answer:
zaharov [31]2 years ago
6 0

Answer:

"Decreasing the sample size."

Step-by-step explanation:

The margin of error is :

ME=z\times \frac{\sigma }{\sqrt{n}}

Therefore, as n decreases, margin of error increases.

In the question we are asked " Which action will not reduce the margin of error."

Therefore, the correct option for which action will not reduce the margin of error is "Decreasing the sample size."

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zvonat [6]
Sine = opposite / adjacent.

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7 0
3 years ago
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How do i work this out?
Karo-lina-s [1.5K]

She has 45% of the original amount left

<h3>Ratio and proportions</h3>

Fractions are written as a ratio of two integers

Given the following

Initial amount. = ∈4000


Amount given to her sister = 1/4 * 4000 = 1000

Amount given to her brother = 40% of 3000 = 1200

Amount left = 4000 - (1000+1200)

Amount left = ∈1800

Determine the percentage left

x * 4000 = 1800

x = 1800/4000

x = 0.45

x = 45%

Hence she has 45% of the original amount left

Learn more proportion here: brainly.com/question/19994681

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5 0
2 years ago
2. If GFE~GJH, find the value of FG.<br> ​
Alex73 [517]

Answer:

  • 77 units

Step-by-step explanation:

Given two similar triangles.

Corresponding parts of similar figures have same ratio.

<u>Use ratios to find the value of x:</u>

  • (4x - 5)/(x + 7) = 35/12.5
  • (4x - 5)/(x + 7) = 14/5
  • 5(4x - 5) = 14(x + 7)
  • 20x - 25 = 14x + 98
  • 20x - 14x = 98 + 25
  • 6x = 123
  • x = 123/6
  • x = 20.5

<u>Find the value of FG:</u>

  • FG = 4*20.5 - 5 = 77

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3 years ago
Write a real world problem that can be solved using the equation 5x = 3x + 20
Murljashka [212]
3 years ago<span>Let x = a certain number of cookies 5x = 3x + 20 5x - 3x = 20 2x = 20 x = 20/2 x = 10 John: 5x = 5(10) = 50 Jerry: 3x + 20 = 3(10) + 20 = 30 + 20 = 50 They both have 50 cookies a piece</span>
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3 years ago
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lina2011 [118]

Answer:

CBA = DEF

Step-by-step explanation:

DEF is the answer because CBA is the exact same triangle as the other one, it just upsidedown.

8 0
2 years ago
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