Lower Quartile Formula For Grouped Data. For continuous frequency distribution the formula for ith quartile is. The formula for quartiles is given by.
40 45 50 55 56 69 75 77 88 90. Upper quartile q3 n 1 3 4. Quartile formula for grouped data.
Now let s calculate the median lower quartile.
The lower quartile also known as q1 separates the lower portion of 25 of data from the highest portion of 75. 10 1 11 q1 will be. Upper quartile q3 n 1 3 4. Q1 the lowest quartile is known as the lower quartile or first quartile.
