Potassium iodide (KI) is used to treat iodine deficiencies. What is the %(w/v) of a 55 mL solution containing 1.3 g of KI?

0.024

My calculator reads more like 2.4 M %.

1.3 g solute x (100/55) = 2.36 which rounds to 2.4.You may not have multiplied by 100.