In the movie "Forrest Gump" what was Forrest's IQ?

"Forrest Gump" is a 1994 American comedy-drama film directed by Robert Zemeckis and written by Eric Roth. It is based on the 1986 novel of the same name by Winston Groom and stars Tom Hanks, Robin Wright, Gary Sinise, Mykelti Williamson and Sally Field. The film follows several decades in the life of a slow-witted and kindhearted Alabama man named Forrest Gump (Hanks) and his experiences in the 20th-century United States.

1981, at a bus stop in Savannah, a man named Forrest Gump recounts his life story to strangers who happen to sit next to him on the bench. As a boy in 1956, Forrest has an IQ of 75 and is fitted with leg braces to correct a curved spine. He lives in Greenbow, Alabama with his mother, who runs a boarding house and encourages him to live beyond his disabilities. Among their temporary tenants is a young Elvis Presley, who plays the guitar for Forrest and incorporates the boy's jerky dance movements into his performances. On his first day of school, Forrest meets a girl named Jenny Curran, and the two become best friends.

Bullied because of his leg braces and dimwittedness, he flees from a group of children, but when his braces break off, he is revealed to be a fast runner. With this talent, he receives a football scholarship at the University of Alabama in 1962, where he is coached by Bear Bryant, becomes a top kick returner, is named to the All-American team, and meets President John F. Kennedy at the White House.