# probability and statistic

Most popular questions and responses by probability and statistic-
## algebra

A biologist knows that the average length of a leaf of a certain full-grown plant is 4 inches. The standard deviation of the population is 0.6 inch. A sample of 20 leaves of that type of plant given a new type of plant food had an average length of 4.2

*asked on May 20, 2017*