Statistics for Maintenance Modelling: Basic Probability Concepts

# Find the Probability of a Random Variable Falling Within a Range¤

Find the probability that a random variable having a standard Normal Distribution will take on a value between 1.30 and 1.75.

Click on the look-up table to calculate your answer. Type it in the textbox to 4 decimal places when you have worked it out and click the "Check Answer" button. Click the "Hint" button for some help in working out the answer.

| P(1.75 > Z 1.3) =

Yes, that's right. You correctly subtracted the probability of Z = 1.75 from the probability of Z = 1.3 to get the answer of 0.0567

No that's not right. The answer is 0.0567. This is obtained by subtracting the probability of Z = 1.75 from the probability of Z = 1.3.

P(Z=1.3) - P(Z = 1.75) = 0.0968 - 0.0401 = 0.0567