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USPshnik [31]
3 years ago
7

To select a sample of five children from a class of 30, a researcher puts each child’s name on a slip of paper, then shuffles th

e papers in a hat and randomly picks five names. What kind of sampling is being used?
Mathematics
1 answer:
Ainat [17]3 years ago
7 0

Answer:

We conclude that  a researcher  used simple random sample.

Step-by-step explanation:

We know that select a sample of five children from a class of 30, a researcher puts each child’s name on a slip of paper, then shuffles the papers in a hat and randomly picks five names.  

We conclude that  a researcher  used simple random sample.

Because every children  has an equal chance of being included in the sample.

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Answer:

2.80

Step-by-step explanation:

The discount is the regular price times the discount

discount = 19 *15%

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The new price is the regular price minus the discount

new price = 19-2.85

                 =16.15

Now she has to pay the sales tax

tax = new price * tax rate

tax= 16.15 * 6.5%

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We add the tax to the new price to get the final price

final price = new price+tax

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Change = payment - final price

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3 years ago
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9514 1404 393

Answer:

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Step-by-step explanation:

Multiply by 4 to clear the fraction.

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Subtract the left-side term to get variables on the same side, with a positive x-coefficient.

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Eliminate parentheses and collect terms.

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Subtract 9 and swap sides to get standard form.

  3x -4y = -9

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Standard form is ...

  ax +by = c

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The attached graph shows the equations give the same line. The original line is shown dotted so that you can see they overlap.

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Answer:

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= 0.2075 × 100

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Hence the percentage decrease is 20.8%

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