You need 250 pieces of wood. justin can hammer 10 1/4 pieces of wood an hour and jason can hammer 9 1/2.how many hours will it take for them to finish the fort? round to the nearest whole number

The ages of personnel in the accounting department of a large company are normally distributed with a standard deviation of 7 years. there is a 0.02275 probability that the age of any randomly chosen person in the department is less than 22 and 0.15866 probabilty that the age of any randomly chosen person is greater than 43. what is the mean of this distribution?