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    1. u = 2.4
    2. s = 2
    3. no of tickets left = 250
    4. no of students = 100
    5. eact stud will get ticket = 250/100 = 2.5
      1. z = 2.5 - 2.4 / (2/10) = 0.5
      1. p(z < .5) = 0.69146