Homework Help Forum: Math

Posted by Anonymous on Sunday, November 1, 2009 at 7:23pm.

Doug had scores of 80, 85, 75, and 80 on his first four exams in a course. a. Find the mean, median, and mode for these exam scores. b. Which “average” would Doug want the teacher to use in determining his grade? c. What score would Doug have to get on a fifth examination to raise his mean score to 84? Is it reasonable to expect Doug to achieve that score?

• Math - Ms. Sue, Sunday, November 1, 2009 at 7:32pm

  We'll be glad to check your answers.

  
  

• Ms. Sue, My Answers - Anonymous, Sunday, November 1, 2009 at 7:42pm

  A. The mean 80+85+75+80=320 320/4=80 Median is 80: 75, 80, 80 ,85 0,0,5,7,8,8,8 mode is 8 B. 80 C. 84 x 5= 420-320=100. Doug would have to make a 100% to have an average of 84. No it isn’t reasonable for Doug to score 100.

  
  

• Math - Ms. Sue, Sunday, November 1, 2009 at 7:50pm

  Your median and mean are correct. The mode is also 80. Your other answers are correct.

  
  

• Math - Anonymous, Sunday, November 1, 2009 at 7:58pm

  Sweet! Thanks

  
  

• Math - Ms. Sue, Sunday, November 1, 2009 at 8:03pm

  You're welcome.

  
  

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