Rearranged: 12,13,15, 36, 39, 41, 41, 43, 43, 47 and 49
Lower quartile or First quartile = total number of items4\;\frac{\text{total number of items}}{4}4total number of items
If odd: items numbers + 1 → 11 items+14\;\frac{11\text{ items}+1}{4}411 items+1
= 124\;\frac{12}{4}412
Lower quartile = 3rd iems →15
