The management of a business concern will be making a decision whether to upgrad
ID: 3128904 • Letter: T
Question
The management of a business concern will be making a decision whether to upgrade their office desktops to Windows 8 from Windows 7. However the management wants to see whether the employees are feeling comfortable in using Windows 8. A one-day training was organized on Windows 8, where all the personnel participated, of whom 12% are secretaries (A). After the seminar a survey was taken. It shows that among secretaries 55% want upgrade to Windows 8 (W8), 20% want no change from Windows 7 (W7), 25% have no preference (NP). Among non-secretarial employees the respective percentages are 38%, 55% and 6.99999999999999%.
As it has been mentioned above that 20% of secretaries want no change from Windows 7. Which of the following is the correct representation of that fact?
P(W7 A) = 0.2
P(A | W7) = 0.2
P(W7 | A) = 0.2
None of the above
If a personnel is selected at random, what is the probability that she made a definite preference, given that she is not a secretary?
If a personnel is selected at random, what is the probability that she made a definite preference?
If a personnel is selected at random, what is the probability that she is not a secretary, given that she made a definite preference?
Explanation / Answer
P(W7 A ) = 0.2 is correct.
the probability that she made a definite preference, given that she is not a secretary is 0.38 + 0.55 = 0.93
the probability that she made a definite preference 0.12*(0.55+0.2) + 0.8*(0.38+0.55)
the probability that she is not a secretary, given that she made a definite preference =
(0.38+0.55) / [0.12*(0.55+0.2) + 0.8*(0.38+0.55)]
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