Answer:
From 350,000 to 449,000
Explanation:
Here, the given number,
400,000
Since, a number is rounded to 400,000 if it is between 350,000 to 449,000 including 350,000 and 449,000
Because, a number having 3 in hundred thousand place is rounded to 400,000, if the ten thousand digit of the number is 5 or more than 5,
Also, a number having 4 in hundred thousand place is rounded to 400,000, if the ten thousand digit of the number is less than 5,
Hence, the possible exact number of people who visited the art museum would be,
From 350,000 to 449,000