MG 620 Statistics for Managers

Hi , Could you please help me with

• The Management at Ohio National Bank does not want its customers to wait in line for service for too long. The manager of a branch of this bank estimated that the customers currently have to wait an average of 8 minutes for service. Assume that the waiting times for all customers at this branch have a normal distribution with a mean of 8 minutes and a standard deviation of 2 minutes.

Find the probability that randomly selected customer will have to wait for less than 4 minutes?

Instructions: Show all steps:

• Draw the normal curve and indicate the mean, standard deviation, and the X bar scale
• Identify the area of interest (that is shade the area under the curve that you will compute the probability).
• Covert the X bar values in Z scores
• Look up the Z standardized table for the cumulative area(s).
• Now,makeyourdecision(thatacustomerwillwaitforlessthan4minutes)

Thank you