In an agricultural experiment, a large uniform field was planted with a single variety of wheat. The field was divided into many plots (each plot being 7 100 ft) and the yield (lb) of grain was measured for each plot. These plot yields followed approximately a normal distribution with mean 88 lb and standard deviation 7 lb. Use Table 3 to find the percentage of the plot yields that were between 75 and 80 lb. Round the percentage to 2 places after the decimal.