Central Tendency

                     Lesson 1

Problem:       For what value of x will 8, 12, and x have the same mean (average) as that of 24 and 12?

Step 1: The mean of 24 & 12 = (24 + 12)/2 = 18

Step 2: Now, find the value of x, knowing that the average of x and 8 must be 18:

 (x + 8 + 12)/3 = 18              

54 = x + 20

Step 3: x = 54-20

x = 34

Step 4:                     The answer is:  34

                                                            Try two practice problems:  

A.	For what value of x will 6, 10, and x have the same mean (average) as that of 20 and 14?
B.	On his first 5 Math tests, David received the following scores:  48, 64, 70, 78 and 62.  What test score must David earn on his sixth test so that his average (mean score) for all six tests will be 60?

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