Paul’s plumbing charges a flat fee of $90 plus $40/h for a plumbing job. perfect pipes charges a flat fee of $60 plus $55/h for a plumbing job write an expression to represent the total cost of a plumbing job for perfect pipes using h to represent the time, in hours, of a plumbing job.

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?