assume that 21-year-old women's heart rates at rest are normally distributed with a mean of 69 beats per minute and a standard deviation of 5 beats...

assume that 21-year-old women's heart rates at rest are normally distributed with a mean of 69 beats per minute and a standard deviation of 5 beats per minute. if 300 women are examined, how many would you expect to have a heart rate less than 71?