Errors in measuring the time (microseconds) of arrival of a wave front from an acoustic source can be approximated by a beta distribution with a = 1, and b = 2. What is the probability that a...

Errors in measuring the time (microseconds) of arrival of a wave front from an acoustic source can be approximated by a beta distribution with a = 1, and b = 2. What is the probability that a measurement error is less than 0.4 microseconds? What are the mean and standard deviation of the measurement errors?