Normally distributed random variables
If x1 and x2 are normally distributed random variables with a mean of 95 and a standard deviation of 20, and that x1 and x2 are independent of each other, then P(x1 and x2 < 60) is:
1. 0.0401
2. 0.0802
3. 0.2115
4. 0.0016
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