Researchers asked two groups of people to construct a jigsaw puzzle. One group of55people, who listened to soft classical music while working, had a mean construction time of45minutes.Another group of45people, who worked in silence, had a mean construction time of55 minutes.Assume the population standard deviations for the construction times for people listening to classical music and people working in silence are9.5minutes and11minutes, respectively. Find the upper bound of the99%

confidence interval for the difference in population construction times between people listening to classical music as they work and people working in silence. Let the people listening to classical music be the first sample, and let the people working in silencebe the second sample.Assume the samples are random and independent. Assume that both the population distributions are normally distributed. Round your answer to two decimal places.