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Homework Help: Statistics problem

  1. Mar 30, 2010 #1
    Suppose that the mean score of a class of 30 students was 78. The 19 male students in the class had a mean score of 68. What was the mean score for the 11 female students?

    advice? thanks.
  2. jcsd
  3. Mar 30, 2010 #2
    19/30 students got 68%. 11/30 students got ___%. What percentage does that blank have to be so that the average of the two percentages are 78%. keep in mind one percentage is weighed heavier because 19/30 is larger than 11/30
  4. Mar 30, 2010 #3
    i got it. i set it up as:

    .78 = (19/30)*.68 + (11/30)*x

    then solved for x. is this how you would have done it?
  5. Mar 31, 2010 #4
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