If a normally distributed group of test scores have a mean of 70 and a standard deviation of 12, find the percentage of scores that will fall below 50. 35.54% 6.75% 45.25% 4.75% For a certain group of individuals, the average heart rate is 72 beats per minute. Assume the variable is normally distributed and the standard deviation is 3 beats per minute. If a subject is selected at random, find the probability that the person has heart rate between 68 and 74 beats per minutes 6.000 0.6568 0.3432 0.2001