Krishna
0

Step 1:  Recall the definition of quartile

               DEFINITION: Quartile is median.

                 Two types: 1) Upper quartile

                                   2) Lower quartile

             Upper quartile:

                  The upper quartile is the median of the higher half of the data.    

             Lower quartile:

                   The lower quartile is the median of the lower half of the data.


Step 2:  Arrange the numbers from least to greatest.

                16, 24, 30, 34, 50, 64, 66, 66, 80, 99 (least to greatest)

             

Step 3: Separate the numbers into a lower half and an upper half.

                         16, 24, 30, 34, 50, 64, 66, 66, 80, 99

                Lower half:  16, 24, 30, 34, 50

                Upper half:  64, 66, 66, 80, 99


Step 4: Find the lower quartile in the lower half

              lower quartile in the middle of the lower half.

                           16, 24, 30, 34, 50


                   The lower quartile is 30.