Respuesta :
The probability that an observation is at least 1 standard deviation above the mean is; 0.159
What is the probability from empirical?
From the empirical rule and the standard normal distribution, we know that;
68% of the observations lie within 1 standard deviation of the mean.
95% lie within two standard deviation of the mean.
99.9% lie within 3 standard deviations of the mean
Thus, it means that the probability that an observation is at least 1 standard deviation above the mean is;
P(z ≥ 1) = 0.159
Read more about Empirical Rule at; https://brainly.com/question/10093236
