Central Tendency And Dispersion

                     Lesson 1

                                                                                                                                                                          

                                                            Problem:   For what value of x will 2, 12 and x have the same mean (average) as that of 15 and 11?                                                           

                                                            Solution     Find the mean of 15 and 11 i.e. (15+11)/2 = 13

                                                            Step 1:                      

                     

                                                            Solution    Now, find the value of x, knowing that the average of x, 2 and 12 must be 13:

                                                            Step 2:       

                                                                                (x + 2 + 12)/3 = 13             

                                                            Solution     39 = x + 14   

                                                            Step 3:         x = 39-14

                                                                                 x = 25

 

                                                            Solution     The answer is: 25

Step 4:                                                    

Complete                                                                   

                                                                                                                               

                                                            

Try two practice problems:        

                                                              

A.

For what value of x will 1, 7 and x have the same mean (average) as that of 15 and 11?

B.

For what value of x will 2, 5 and x have the same mean (average) as that of 10 and 16?

                    

 

                                                                                               

 

 

 

 

 

        

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