Krishna
0

Step 1: Find the sum of the numbers.


            NOTE: Mean = \frac{\text{ Sum of the variables}}{\text{Total number of variables}}

                  

              GIVEN: 1, t, 8, 8.

              There are 4 numbers in the group.    

              Sum of the numbers.        

              1 + t + 8 + 8 = t + 17


Step 2: Find the missing number

                   Mean = \frac{t + 17}{8}


                        6 = \frac{t + 17}{8}  


                      t + 17 = 6 * 4


                      t + 17 = 24


                            t  = 24 - 17


                            t  =  7