Reading a two-way table

You will write functions that read a two-way table stored as a list of rows: a conditional probability, an expected count, and a test for independence.

The idea. table[i][j] is the count in row i and column j. Given column j, the share of row i is table[i][j] divided by the column total. If the rows and columns were independent, each count would be the row total times the column total, divided by the grand total.

Your tasks.

1. Finish given_column(table, i, j). Return the probability of row i, given column j.
2. Finish expected(table, i, j). Return the count expected in row i and column j if the two answers were independent.
3. Finish independent(table). Return True when every count equals its expected count.