Empirical Rule

Question

suppose the weights of eggs are normally distributed with a mean of 55 grams and standard deviation of 9 grams. According to the empirical rule, for the middle 95% of all eggs we would expect the weight of the eggs to be between

Answer 1

The middle 95% of all eggs lies within 2 standard deviations (18) from the mean, i.e. between 55-18 and 55 + 18 or between 37 grams and 73 grams.