gaokao 2016 Q4

gaokao · China · national-I 5 marks Continuous Uniform Random Variables
A company's shuttle bus departs at 7:30, 8:00, and 8:30. Xiaoming arrives at the bus station between 7:50 and 8:30 to board the shuttle, and his arrival time is random. The probability that his waiting time does not exceed 10 minutes is
(A) $\frac { 1 } { 3 }$
(B) $\frac { 1 } { 2 }$
(C) $\frac { 2 } { 3 }$
(D) $\frac { 3 } { 4 }$
A company's shuttle bus departs at 7:30, 8:00, and 8:30. Xiaoming arrives at the bus station between 7:50 and 8:30 to board the shuttle, and his arrival time is random. The probability that his waiting time does not exceed 10 minutes is

(A) $\frac { 1 } { 3 }$

(B) $\frac { 1 } { 2 }$

(C) $\frac { 2 } { 3 }$

(D) $\frac { 3 } { 4 }$