1,Suppose a bus arrive at a bus stop every 20 minute and that

the waiting time for the next bus to arrive as a uniform probability distribution on the interval

from 0 to 20 minute.

a,compute the mean and standard deviation of the persons waiting time x.what is the probability that x were seen 10 minute

b,The probability density function of time x required to compute an assembly operation is uniformly distributed for the interval

30</x</40

i,Determine the proportion of assembly that requires less than 35 sec to complete

ii,what time is exceeded for the waiting time x