The table below shows the lengths of 40 babies at birth. To calculate the cumulative frequencies ... value and find the median length. The interquartile range is a measure of how spread out ...
A cumulative frequency ... find the upper quartile, use \(\frac{3}{4}\) instead. \(\frac{3}{4}\) of 40 = 30. Read across at 30 and down. The upper quartile is about 47 cm. The interquartile range ...