Which equations from the options listed would I use to solve the following problems. Please show me step by step how to solve the problems.

1. Suppose the average number of patients seen by a specialist per day is six.What is the probability that the specialist will see five patients on a given day?
2. According to a recent article, 3% of babies requiring intensive care at birth were also born with significant hearing loss.Suppose that five babies requiring intensive care at birth are randomly surveyed.What is the probability that exactly one was born with significant hearing loss?
3. The average length of maternity stay in a hospital is said to be 2.5 days with a standard deviation of 0.8 days.In a random survey of 45 women who recently gave birth in hospital, what is the probability that the average stay was between 2.2 to 2.3 days?
4. Following a restructuring of a large hospital's kitchen menu by an expert nutritionist, it is determined that 80% of all patients enjoy the new food.Supposed that 105 patients are sampled.Find the probability that 70% or more of the sampled patients will enjoy the food.

which equations would I use to solve these problems . a) Op = (n ( 1 - TL ) and 2 = X - up n Op b ) P - el p x X 1 c ) P ( x ) = no X ! ( n - D! ) 2 ( 1 - z ) n - x 2 ox = and z - X - Ux n ox