Answer: 3'9" to 4'9"
Explanation: As a fictional character, Jamie Bennett's height has not been officially stated in the film "Rise of the Guardians" or in any other official sources. However, based on his appearance in the film and his age (around 7-9 years old), it is likely that he is of average height for a boy his age, which can range from approximately 3'9" to 4'9".