Question 762057
THe first answer re proper distribution function is correct.
However your second answer assumes that 10, 12, and 14 are each equally likely (same probability). The correct answer is
(1) P(x<16) = 0.02 + 0.70 + 0.05 or
(2) P(x<16) = 0.77 or
(3) P(x<16) = 77%