Normal distribution calculator
CDF P(X ≤ x) for N(μ,σ²).
Calculator
How to use
Approximate Φ
Standard normal approximation.
Educational use only. For assessments, show reasoning and check boundary cases.
CDF P(X ≤ x) for N(μ,σ²).
Standard normal approximation.
Educational use only. For assessments, show reasoning and check boundary cases.
Model / formula
CDF of normal (approximate Φ)
Result
P(X ≤ 0) ≈ 0.500000 (N(0,1²))