Approximate the following binomial probabilities by the use of normal approximation. Eight percent ...

Approximate the following binomial probabilities by the use of normal approximation. Eight percent of customers of a bank keep a minimum balance of 500 in their checking accounts. What is the probability that in a random sample of 100 customers
 a. exactly 6 keep the minimum balance of 500?
  b. exactly 11 keep the minimum balance of 500?
  c. 6 or fewer keep the minimum balance of 500?
  d. 5 or more keep the minimum balance of 500?
  e. 10 or fewer keep the minimum balance of 500?
  f. 11 or fewer keep the minimum balance of 500?