A set of average city temperatures in December are normally distributed with a mean of 16. 3 ^\circ \text{C}16. 3 ∘ C16, point, 3, degrees, start text, C, end text and a standard deviation of 2 ^\circ \text{C}2 ∘ C2, degrees, start text, C, end text. What proportion of temperatures are between 12. 9^\circ \text{C}12. 9 ∘ C12, point, 9, degrees, start text, C, end text and 14. 9^\circ \text{C}14. 9 ∘ C14, point, 9, degrees, start text, C, end text? You may round your answer to four decimal places