Lower Quartile Formula For Even Data. Upper quartile middle value of the upper half 36. Formula for lower quartile q1 n 1 multiplied by 1 divided by 4 formula for middle quartile q2 n 1 multiplied by 2 divided by 4 formula for upper quartile q3 n 1 multiplied by 3 divided by 4 formula for interquartile range q3 upper quartile q1 lower quartile.
Interquartile range q3 q1. Therefore the lower half of the data is. 25 of the measurements of the given dataset that are represented by q1 are not greater than the lower quartile then the 50 of the measurements are not greater than the median i e q2 and lastly 75 of the.
Since there is an even number of values we need the mean of the middle two values to find the first quartile.
The interval where the first quartile lies has the cumulative frequency of 10. Iqr q 3 q 1. Formula for lower quartile q1 n 1 multiplied by 1 divided by 4 formula for middle quartile q2 n 1 multiplied by 2 divided by 4 formula for upper quartile q3 n 1 multiplied by 3 divided by 4 formula for interquartile range q3 upper quartile q1 lower quartile. C the cumulative frequency of the previous interval of relevant quartile class 3.
