Answer to Question #95587 in Statistics and Probability for [e-mail]

Question

How to calculate mid 70% range? What is meant by this?

Answer 1

Percentiles are like quartiles, except that they divide the data set into 100 equal parts instead of four equal parts. The K-th Percentile is that number such that K % of all data values are less and (100 - K) % are larger than it, or to be more precise, at least K% of the sorted values are less than or equal to it and at least (100 - K) % of the values are greater than or equal to it. 

If we think it best to disregard 15% at each end, we will report the distance between the 15th percentile and the 85th percentile, thus focusing on the middle 70% of the measurements.

$$mid \ 70\% \ range=85\ percentile-15\ percentile$$