Please solve the following Statistical problem using Python

In a small city there are 5 primary-cumsecondar}r schools with 10 classes each. The number of students by classes are given in the following Table: Number of students in Class School 1 School 2 School 3 School 4 School 5 Draw a single stage cluster sample of 3 schools and hence estimate the4 mean number of students per school and estimate the variance of the mean