Agovernment's department of transportation reported that in2009, airline A led all domestic airlines inon-time arrivals for domesticflights, with a rate of 83.8%. Complete parts a through e below.

a. What is the probability that in the next sixflights, exactly four flights will be ontime?

The probability is

nothing

.

(Round to four decimal places asneeded.)

b. What is the probability that in the next sixflights, two or fewer will be ontime?

The probability is

nothing

.

(Round to four decimal places asneeded.)

c. What is the probability that in the next sixflights, at least four flights will be ontime?

The probability is

nothing

.

(Round to four decimal places asneeded.)

d. What are the mean and standard deviation for thisdistribution?

The mean of the number ofon-time arrivals is

nothing

.

(Type an integer or a decimal. Do notround.)

The standard deviation of the number ofon-time arrivals is

nothing

.

(Round to four decimal places asneeded.)