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Posted by on Sunday, October 16, 2011 at 11:17pm.

Starting with the data values 70 and 100, add three data values to the sample so that the mean is 81, the median is 91, and the mode is 91.

How do i do this??

  • Plz help me Sue!! - , Sunday, October 16, 2011 at 11:34pm

    If the mode (most frequently occurring score) = 91, at least 2 of the scores = 91. You only need to find one more score. Use the mean.

    81 = (x+70+91+91+100)/5

    Solve for x.

    To check, it should still lead to a median of 91.

  • statistics - , Sunday, October 16, 2011 at 11:35pm

    Indicate your subject in the "School Subject" box, so those with expertise in the area will respond to the question.

  • Plz help me Sue!! - , Sunday, October 16, 2011 at 11:43pm

    81 = (x + 352)/5
    81 = 352x/5
    81 = 70.4x
    x = 1.15??

  • Plz help me Sue!! - , Sunday, October 16, 2011 at 11:50pm

    Did i do that correctly??

  • Plz help me Sue!! - , Sunday, October 16, 2011 at 11:56pm

    No, X+352 ≠ 352x

    81 = (x + 352)/5

    Multiply both sides by 5, then subtract 352 from both sides.

  • Plz help me Sue!! - , Monday, October 17, 2011 at 12:14am

    oh....so i get x = 53??

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