Scores on an exam follow an approximately normal distribution with a mean of 74. 3 and a standard deviation of 7. 4 points. What percent of students scored below 80 points?.

Explain how you might determine the rate of weathering on a sample rock

In an ecosystem, marsh snails feed on phytoplankton and painted turtles feed on marsh snails. pollution has resulted in the depletion of phytoplankton. what effect would this situation likely have on the population of marsh snails and painted turtles? as phytoplankton were destroyed, the population of marsh snails would most likely then the population of painted turtles would mostly likely a. 1. increase 2. decrease 3. stay the same b. 1. increase 2. decrease 3. stay the same

What is 7/81 as a percentage? round your answer to the nearest tenth of a percent.