According to empirical rule, the area under the normal distribution or "bell-shaped curve", when plotted as a function of the z-parameter can be defined in terms of percentages. The z-parameter (or z-score) is defined as where x = value of random variable, μ = the mean, σ = standard deviation,
The total area under the curve = 1. The curve below shows that within 2 standard deviations from the mean, the total area under the curve is 95% of the total area.
Step-by-step explanation: one mile equals to 5280 feet, so 607200 divided into 5280 is 115 and as your timing don’t change you can convert only the distance