Homework Answers
| for normal distribution z score =(X-μ)/σ | |
| here mean= μ= | 85 |
| std deviation =σ= | 40.0000 |
| sample size =n= | 100 |
| std error=σx̅=σ/√n= | 4.0000 |
| probability = | P(X<80) | = | P(Z<-1.25)= | 0.1056 |
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