The measures of positions that divide a distribution into four, ten, and hundred equal parts.

It is the nine score points which divide a distribution into ten equal parts.

Quantiles is the score points which divide a distribution into four equal parts.  

Percentiles is the ninety-nine score points that divide a distribution into one hundred equal parts so that              each part represents  1/100  of the data set.

It is typically defined as the proportion of scores in a distribution that a specific score is greater than or equal to.

It is the difference between the upper and the lower quartile of the data.

The upper quartile is less than or equal to 75% of the data.

The lower quartile is less than or equal to 25% of the data.

The median or second quartile has a value less than or equal to __________ of the data.

The median score is also the 3rd quartile.

Given the data 12, 5, 3, 8, 15, 9, 10. Find the second quartile.

Given the data 42, 47, 51, 63, 48, 56, 34, 36, 58, 60. Find the lower quartile.

Given the data 12, 17, 16, 14, 13, 16, 11, 14, 11,11, 18, 20, 13. Find the upper quartile.

The scores of 17 students on a Math quiz are as follows:12, 15, 8, 9, 5, 18, 20, 10, 10, 7, 3, 17, 19, 20, 6, 14 ,14. Find the lower quartile.

These are the raw scores of 27 Grade 10 Students in a Mathematics Test 90   87    87    87    85    84    83    82    80   80   79    79   78  78  77   77    76    76    75    75    75    74    74   73    72   72    71. Determine the first decile.