How do I calculate probability given mean and standard deviation?
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Answer:
Yes. Z score = (25 - 20)/5 = 1 From Z table Pr = 0.3413 This is the probability that it takes between 20 and 25 minutes, i.e. the area under the curve between Z and 0. The probability that it is greater than 25 is 0.5 so Pr. of > 20 minutes = 0.5 + 0.3413 = 0.8413
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Other answers
Yes. Z score = (25 - 20)/5 = 1 From Z table Pr = 0.3413 This is the probability that it takes between 20 and 25 minutes, i.e. the area under the curve between Z and 0. The probability that it is greater than 25 is 0.5 so Pr. of > 20 minutes = 0.5 + 0.3413 = 0.8413
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