help me understand step by step in excel Step 5: Calculate Cumulative Probabilities Add another column for "Cumulative Probability." Calculate the cumulative probability by adding the current probability to the sum of all previous probabilities. For example, if the probabilities are 0.16, 0.28, 0.32, 0.16, and 0.08, the cumulative probabilities will be 0.16, 0.44, 0.76, 0.92, and 1.00, respectively