The lengths of a certain species of fish are approximately normally distributed with a given mean (look at the picture) and standard deviation (look at at the picture) . According to the Empirical Rule, what percentage of the fish will have lengths within 1 standard deviation of the mean?

34%

47.5%

68%

99.7%

The lengths of a certain species of fish are approximately normally distributed with a given mean (look at the picture) and standard deviation (look at at the p class=