Question: A school contains students in grades 1, 2, 3, 4, 5, and 6. Grades 2, 3, 4, 5, and 6 all contain the same number

A school contains students in grades 1, 2, 3, 4, 5, and 6. Grades 2, 3, 4, 5, and 6 all contain the same number of students, but there are twice these numbers in grade 1. If a student is selected at random from a list of all the students in the school, what is the probability that she will be in grade 3?

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