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statistics

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1. Suppose the number of students in line during office hours:

# of Students (X) Probability P(X)
0 0.40
1 0.30
2 ????
3 0.10

a. If you knew that the number of students in line was between 0 and 3, what is the probability that will be 2 students in line when you arrive at the office

  • statistics -

    Total probability of all events = 1.

    .4 + .3 + ? + .1 = 1

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