Find the probability that less than five students voted in the election.
2-. A fair die with six faces is rolled 40 times. What is the variance of the variable defined as the occurrence of an even number (2, 4 or 6)?
3According to a hospital administrator, historical records over the past 10 years have shown that 20% of the major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients has just been conducted. What is the probability that at less than 70 patients will not be satisfied with the after-surgery care?
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