Because some passengers who make flight reservations do not showup to claim their reservations, airlines often overbook flights. A certain flight has capacity of seating 203 passengers. The airline believes that the rate of passenger"no-show" is 5% and has made reservations for 206 passengers for this flight. Let random variable X be the number of "no-show"s for this flight. Then the standard deviation of X is:

3.128

3.105

9.641

9.784