A normally distributed random variable has a mean of 100 and a standard deviation of 12. The probability of observing a value greater than 82 is the cumulative distribution function (cdf) of the standard normal variable:
A N(1.5).
B N(–1.5).
C 1 – N(1.5).
A is correct. The standardized value of this normal distribution can be obtained using the formula (X – μ)/σ = (82 – 100)/12 = –1.5. The cdf of N(–1.5) provides the probability of a value less than or equal to 82.
难道不是这个嘛P(x>-1.5)=1-P(1.5) 请问C 选项什么时候用的
