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Mnenie [13.5K]
4 years ago
10

Sales prices of baseball cards from the 1960s are known topossess a skewed-right distribution with a mean sale price of $5.25and

a standard deviation of $2.80. Suppose a random sample of 100cards from the 1960s is selected. Describe the samplingdistribution for the sample mean sale price of the selectedcards.a. Skewed-right with a mean of $5.25 and a standard error of$2.80b. Normal with a mean of $5.25 and a standard error of$0.28c. Skewed-right with a mean of $5.25 and a standard error of$0.28d. Normal with a mean of $5.25 and a standard error of$2.80
Mathematics
1 answer:
Serga [27]4 years ago
6 0

Answer:

c. Skewed-right with a mean of $5.25 and a standard error of$0.28

Step-by-step explanation:

As we have given that Sales prices of baseball cards have a right-skewed distribution with a mean $5.25 and a standard deviation is $2.80.

Now, We know that if standard deviation = σ

then, standard error = \frac{\sigma}{\sqrt{n}}

As, we have standard deviation = $2.80

then standard error will be \frac{2.80}{\sqrt{100}}

⇒ Standard error = $0.28

Hence, Option (c) is the correct option.

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The answer is:  [C]:  -0.7, ⅕, 0.35, ⅔ .
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Explanation:
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<span>
Note that in this correct Answer choice "C" given, we have the following arrangement of numbers:
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   </span>→ -0.7, ⅕, 0.35, ⅔ ; 
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We are asked to find the "Answer choice" (or, perhaps, "Answer choices?") given that show a set of numbers arranged in order from "least to greatest"; that is, starting with a value that is the smallest number in the arrangement, and sequentially progressing, in order from least to greatest, with the largest (greatest) number in the arrangement appearing as the last number in the arrangement.
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Note the EACH of the 4 (four) answer choices given consists of an arrangement with ONLY one negative number, "- 0.7".  Only TWO of the answer choices—Choices "B" and "C"—have an arrangement beginning with the number, "-0.7 ";  So we can "rule out" the "Answer choices: [A] and [D]".
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Let us examine: Answer choice: [B]: <span>-0.7, 0.35, ⅕, ⅔ ; 
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Note: The fraction, "⅕" = "2/10"; or, write as: 0.2 .
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          The fraction, "⅔" = 0.6666667 (that is 0.6666... repeating; so we often               see a "final decimal point" rounded to "7" at some point.
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Through experience, one will be able to automatically look at these 2 (two) fractions and immediately know their "decimal equivalents".
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Otherwise, one can determine the "decimal form" of these values on a calculator by division:
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→ ⅕ = 1/5 = 1 ÷ 5 = 0.2
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→ ⅔ = 2/3 = 2 ÷ 3 = 0.6666666666666667
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For Answer choice: [B], we have:
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→   -0.7, 0.35, ⅕, ⅔ ; 
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→ So, we can "rewrite" the arrangement of "Answer choice [B]" as:
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    →  -0.7, 0.35, 0.2, 0.666666667 ;
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    → And we can see that "Answer choice: [B]" is INCORRECT; because
"0.2" (that is, "⅕"), is LESS THAN "0.35".  So, "0.35" should not come BEFORE "⅕" in the arrangement that applies correctly to the problem.
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Let us examine: Answer choice: [C]:  -0.7, ⅕, 0.35, 0.666666667 .
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→ Remember from our previous— and aforementioned—examination of "Answer Choice: [B]" ; that:
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→ Answer choice: [C]: -0.7, 0.2, 0.35, 0.666666667 ;
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6 0
3 years ago
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marshall27 [118]

Answer:

Step-by-step explanation:

<u>Method 1:</u>

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As you're finding how much is left:

10/10-1/10=9/10

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9/10=0.9

300*0.9=$270

OR

<u>Method 2: </u>

1/10=0.1

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Take away 30 from $300

$300-30=$270

By using either method, You would still have $270 left.

How this helps!!!

Have a nice day :)

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Hope that helps!!!!!!

7 0
3 years ago
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Answer:

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