#interquartile

S1 §2.3.9 (E) Exercise Q8 (IPR for grouped continuous data)

Exercise Q8. (E) A train travelled from Lancaster to Preston. The times, to the nearest minute, it took for the journey were recorded over a certain period. The times are shown in the table.Time for journey (minutes)Frequency15 – 16517 – 181019 – 203521 – 2210(a) Calculate the 5% to 95% interpercentile range. [3 marks](b) Estimate the number of data values that fall within this range. [1…

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When we have to find the dispersion in statistics, we use the Interquartile Range( IQR). The IQR is the difference between the third and the first quartile. It is the measure of the dispersion of all the values of the range. We can use the quartile calculator to find the value of the quartile.

The formula we use to find the  Interquartile Range( IQR) is subtracting the values of the third quartile from the first quartile. If you are having a problem, how to find quartiles, then you can use the quartile calculator by calculator-online.net to find the values of the quartile.

                                            IQR=Q3- Q1

You may wonder how to find quartiles of a given data, there is a different method of finding the  Interquartile Range( IQR) of even and odd numbers of data.