Calculates probability density, assuming normal distribution

NormalPDF.swift

# The normal probability density function (PDF) is used in statistics to calculate the probability of a specific value occurring in a normal distribution. 

func normalProbabilityDensityFunction(x: Double, mean: Double, stdDev: Double) -> Double {
    let power = pow((x - mean), 2)
    let numerator = exp(-1.0 * power / (2.0 * stdDev * stdDev))
    let denominator = 2.0 * Double.pi * stdDev * stdDev
    return 1.0 / sqrt(denominator) * numerator
}

print(normalProbabilityDensityFunction(x: 60, mean: 64.43, stdDev: 2.99))