One-Variable Data: Distributions and Measures of Center and Spread

SAT Math· difficulty 4/5

A test was taken by 30 students with mean score 75. After regrading, 5 students got 10 extra points each. What is the new mean?

  • A

    77

  • B

    85

  • C

    75

  • D

    76.67

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Explanation

Total added = 5×10=505 \times 10 = 50 points. New total = 30(75)+50=230030(75) + 50 = 2300. New mean = 2300/3076.672300/30 \approx 76.67.

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