Let X represent the time it takes from when someone enters the line for a roller coaster until they exit on the other side. Consider the probability model defined by the cumulative distribution function given below. 0 x < 3 F(x) = (x-3)/1.27 3 < x < 4.27 1 x > 4.27 a) What is E(X)? Give your answer to three decimal places. b) What is the value c such that P(X < c) = 0.22? Give your answer to four decimal places.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

42.4

step-by-step explanation:

convert to decimal

40 i don’t know lololol