由题意可知:X~N(52,62),n=36P(50.8≤ X ≤53.8)=P( 50.8?52 6/ 36 ≤ X ?μ σ/ n ≤ 53.8?52 6/ 36 )=Φ(1.8)?Φ(?1.2)=0.9641-(1-0.8849)=0.849故答案为:0.849