The time between arrivals of vehicles at particular intersection follows an exponential probability distribution with a mean of 10 seconds. What is the probability that the arrival time between vehicles is 8 seconds or less?What is the probability of 20 or more seconds between vehicle arrivals?

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

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