標題:
math-normal distribution
發問:
A set of concrete cubes with the random strengh variable X~N(39,42),find the probability of strength X between 30mPa and 42mPa.
最佳解答:
Answer: 0.595824 Pr (30 <= X <= 42) = Pr( (30 - 39)/√42 < Z < (42 - 39)/√42 ) = Pr( -1.3887 < Z < 0.46291 ) = 0.595824 So, the probability of strength X between 30mPa and 42mPa is 0.595824
math-normal distribution
發問:
A set of concrete cubes with the random strengh variable X~N(39,42),find the probability of strength X between 30mPa and 42mPa.
最佳解答:
Answer: 0.595824 Pr (30 <= X <= 42) = Pr( (30 - 39)/√42 < Z < (42 - 39)/√42 ) = Pr( -1.3887 < Z < 0.46291 ) = 0.595824 So, the probability of strength X between 30mPa and 42mPa is 0.595824
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