Final answer:
There are 70 movies greater than 90 minutes in length.
Step-by-step explanation:
To find the number of movies greater than 90 minutes in length, we need to add up the frequencies of the movies in the intervals 91 to 120 minutes and over 120 minutes. According to the given histogram, there are 55 movies in the interval 91 to 120 minutes and 15 movies in the interval over 120 minutes. Adding these frequencies, we get a total of 70 movies that are greater than 90 minutes in length.