The amount of television viewed by today's youth is of primary concern to a certain organization. three hundred parents of elementary school-aged children were asked to estimate the number of hours per week that their child watched television. the mean and the standard deviation for their responses were 1919 and 44, respectively. the organization constructed a stem-and-leaf display for the data that showed that the distribution of times was a bell shaped distribution. give an interval around the mean where most (approximately 95%) of the television viewing times fell in the distribution