China Naming Network - Fortune telling knowledge - Using systematic sampling method, samples with a capacity of 20 were taken from 180 students, and 1: 180 students were randomly selected from 180, and divided into 20 samples on average according to the number order.
Using systematic sampling method, samples with a capacity of 20 were taken from 180 students, and 1: 180 students were randomly selected from 180, and divided into 20 samples on average according to the number order.
Let's set the randomly selected number in the 1 group as x,
Because 180 students are divided into 20 groups with 9 students in each group.
Then the number to be drawn for the 16 group is135+x.
That is 135+x= 140,
∴x=5.
So the answer is: 5.