The distribution of X = the standby time for a smart phone battery from a major carrier in the US is ap proximately normal with a mean of 300 minutes and a standard deviation of 70 minutes. Between what two times do the middle 95% of the smartphone standby battery lives fall? (162.8,437 .2) KW (1984,4616) (\"N (1.960 ,1.960) (130.11,470.2)