An agency is conducting performance tests of different brands of skateboards. Tests show

that the pressure, in pounds/ sq. in, required to break the boards is normally distributed with

a mean of 54 and a standard deviation of 6.2. (13)

a) What percent of the boards have breaking pressures between 50 and 60?

b)What is the probability that any board will require at least a pressure of 70 to break?

c) In what range, centered on the mean, will 80% of the data lie?