please give the excel formula used

On average stoppages on the assembly line at Jamari Industries occur at a rate of 0.1 per hour. Assume all the Poisson conditions are met a) determine the probability of having exactly two stoppages in a 10-hour period. b) determine the probability of having no stoppages in a 20-hour period. c) determine the probability of having no more than one stoppage in a 30-hour period. d) determine the probability of having at least two stoppages in a 15-hour period. W 5 16