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A set of N = 10 scores has a mean of µ = 50. If 20 points are added to one of the scores, what is the new value for the population mean?​Group of answer choices

Question

A set of N = 10 scores has a mean of µ = 50. If 20 points are added to one of the scores, what is the new value for the population mean?​Group of answer choices

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Solution

Sure, let's solve this step by step.

  1. Calculate the original total sum of the scores:

    • The mean (µ) of the scores is 50.
    • The number of scores (N) is 10.
    • The total sum of the scores can be calculated as: Total Sum=Mean×Number of Scores=50×10=500 \text{Total Sum} = \text{Mean} \times \text{Number of Scores} = 50 \times 10 = 500
  2. Add 20 points to one of the scores:

    • When 20 points are added to one of the scores, the new total sum of the scores becomes: New Total Sum=500+20=520 \text{New Total Sum} = 500 + 20 = 520
  3. Calculate the new mean:

    • The number of scores (N) remains the same, which is 10.
    • The new mean (µ') can be calculated as: New Mean=New Total SumNumber of Scores=52010=52 \text{New Mean} = \frac{\text{New Total Sum}}{\text{Number of Scores}} = \frac{520}{10} = 52

So, the new value for the population mean is 52.

This problem has been solved

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