rival time between vehicles is 11 seconds or less? As with all other distributions, the entire area under the curve will sum to 1. This area is also referred to as the cumulative probability and the formula to find the area is given below where x is a specific value of the random variable x. P ( x 5 x ) = 1 - exo/k Here, we want to find the probability that the arrival time between vehicles is 11 seconds or less. Thus, x 11 11 and the probability statement is P XS 11 Step 3 The mean was given to be u = 11 and x, was determined to be 11. Substitute these values into the formula for the cumulative probability to find the probability that arrival time between vehicles is 11 seconds or less, rounding the result to four decimal places. P(x 5 11) = 1 -exo/# (-11/ X Your answer cannot be understood or graded. More Information X Enter a number