A salesman normally makes a sale (closes) on 70% of his presentations. Assuming the presentations are independent, find the probability of the following. a) He fails to close for the first time on his sixth attempt. b) He closes his first presentation on his fifth attempt. c) The first presentation he closes will be on his second attempt. d) The first presentation he closes will be on one of his first three attempts.

a) P(X=6)=enter your response here

(Round to four decimal places as needed.)

b) P(X=5)=enter your response here

(Round to four decimal places as needed.)

c) P(X=2)=enter your response here

(Round to four decimal places as needed.)

d) The probability the first presentation he closes will be on one of his first three attempts is

(Round to four decimal places as needed.)