Can Somebody help me with the following question?

1. Quality control department, during the test, found that new mail sorting machine will incorrectly sort packages ELDE- of the times- If 25 packages are randomly selected, nd the following probabilities: {Express your answers correct to 4 decimal places) a] Exactly 3 packages will be sorted incorrectly. [2 marks] b] At most 2 packages wilt be sorted incorrectly. [3 marks] :1 Find the mean [1 mark]