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

SAT Math· difficulty 3/5

A dot plot shows: 55 (3 dots), 66 (2 dots), 77 (4 dots), 88 (1 dot). What is the mean?

  • A

    6.3

    check_circle
  • B

    6.0

  • C

    6.5

  • D

    7.0

Explanation

Sum = 5(3)+6(2)+7(4)+8(1)=15+12+28+8=635(3) + 6(2) + 7(4) + 8(1) = 15 + 12 + 28 + 8 = 63. Count = 1010. Mean = 63/10=6.363/10 = 6.3.

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