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Statistics problem

  • Thread starter coreyB
  • Start date
  • #1
9
0
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.
 

Answers and Replies

  • #2
1,033
1
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
 
  • #3
9
0
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?
 
  • #4
1,033
1
yup.
 

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