Question 8 involves statistics

Question

A normal distribution is observed from the body weights of the forty students in a class. If the mean is 125 pounds and the standard deviation is 9 pounds, what is the probability that a randomly selected student has a body weight between 116 and 134 pounds? Use the empirical rule.

1. Provide the final answer as a percent.

Answer 1

68%

68% of the weights fall within one standard deviation from the mean. 116 to 134 is 125-9 to 125+9

the empirical rule is 68-95-99 or 68% for the interval within 1 standard deviation from the mean, 95% for 2 and 99 for 3.