This question needs to be answered only in Excel format, please. Can you please tell me how to put it in excel? Thank you!

A study is conducted to assess the impact of caffeine consumption, smoking, alcohol consumption, and physical activity on cardiovascular disease. Suppose that 40% of participants consume caffeine and smoke. If eight participants are evaluated, what is the probability that:

a. Exactly half of them consume caffeine and smoke?

b. At most, six participants consume caffeine and smoke?