#include <bits/stdc++.h>
#include <math.h>

using namespace std;

// You have a sample of 100 values from a population with mean mu=500
// and with standard deviation sigma=80. Compute the interval that
// covers the middle 95% of the distribution of the sample mean; in
// other words, compute A and B such that P(A < x < B) = 0.95. Use the
// value of z=1.96. Note that z is the z-score.

// Confidence interval
// mean - z * sigma/sqrt(n)
// mean + z * sigma/sqrt(n)

int main()
{
    int n = 100;
    int mean = 500;   // mu
    int stddev = 80;     // sigma
    double zscore = 1.96;   // 95%
    
    double A = mean - zscore * stddev / sqrt(n);
    double B = mean + zscore * stddev / sqrt(n);
    
    cout << fixed << setprecision(2) << A << endl;
    cout << fixed << setprecision(2) << B << endl;    
}