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 Pre-Algebra: 7th Grade: "Raise a Median"
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Posted - 09/09/2010 :  20:44:32  Show Profile  Reply with Quote
Note: each person has taken four tests and has one more test to take. Find the score that each person must make to change the mean or the median as shown.

Problem: Liz has scores of 87, 75, 82, and 93. She wants to raise the median to 87.

I know that you put the number in order from least to greatest. You then take the numeber in the middle if its an odd set of numbers. If its and even set you add the two middle numbers and divide that answer by 2. This will give you the median.

75, 82, 87, 93 = 82+87=169/2=84.5, median = 84.5. How do I raise it to make it a 87?

Edited by - Maeve75 on 09/09/2010 21:51:57
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Posted - 09/10/2010 :  16:54:01  Show Profile  Reply with Quote
Since you want the median to be 87 and there will be 5 tests, you need to make 87 the middle score. It follow that you need 2 above 87 nd 2 below. At present you have 1 above and 2 below, so.....
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