I need the answer of part3 only. Thanks

Susan tries to exercise at "Pure Fit" Gym each day of the week, except on the weekends (Saturdays and Sundays). Susan is able to exercise, on average, on 75% of the weekdays (Monday to Friday).

i. Find the expected value and the standard deviation of the number of days she exercises in a given week. [2 marks]

ii. Given that Susan exercises on Monday, find the probability that she will exercise at least 3 days in the rest of the week. [3 marks]

iii. Find the probability that in a period of four weeks, Susan exercises 3 or less days in only two of the four weeks.