At the Valley Medical Center in San Jose, a certain surgical procedure takes an average of 162.8 minutes with a standard deviation of 4.9 minutes. The data are approximately bell-shaped. Between what two boundaries of time will approximately 95% of the surgical procedures be completed? Group of answer choices Between 157.9 and 167.7 minutes Between 153 and 172.6 minutes Between 148.1 ans 177.5 minutes