IDNLearn.com: Where curiosity meets clarity and questions find their answers. Our experts provide prompt and accurate answers to help you make informed decisions on any topic.

From 1975 through 2020, the mean annual gain of the Dow Jones industrial Average was 651. A random sample of 34 years is selected from this population. What is the probability that the mean gain for the sample was between 400 and 800? Assume sigma 1540.