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its applied engineering data analysis course

Q3 A signal frequency measurement shows that frequency, X, is normally distributed with a mean of 100 and a variance of 5 ie X N (100, 5). SKETCH THE AREA and calculate the following probabilities: a. P(90 s X S125) b. P(X298) c. Find the x such that P(X Sx)-0.1 d. Find the range that contains the MIDDLE 90% of the observations: ie. find a, such that x is in [100-a, 100 + a] with 90% probability

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