1. An agency is conducting performance tests on different brands of skateboards.Tests show that the pressure, in pounds per square inch, required to break the boards is normally distributed with a mean of 54.7 and a standard deviation of 6.2.
   1. What percent of the boards have breaking pressures between 50 and 60?
   2. What is the probability that any board will require at least a pressure of 70 to break?
   3. In what range centered on the mean will 80% of the data lie?