from scipy.stats import binom

# binom.pmf(k, n, p) で確率質量関数を計算
probability = binom.pmf(30, 100, 0.5)

print(f"100回中30回表が出る確率: {probability:.8f}")
print(f"パーセンテージ表記: {probability * 100:.6f}%")