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Selected drivers will be wearing a seatbelt

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Reference no: EM131615507

Suppose 80% of all drivers always wear a seatbelt. A simple random sample of 100 drivers is observed while they are driving and their seatbelt use is recorded. What is the probability that more than 75 of the selected drivers will be wearing a seatbelt?

  1. 0.87
  2. 0.89
  3. 0.92
  4. 0.94
  5. Not enough information to determine. 

How would i solve this question and i think it is using normal approx but without st dev how can the answer be 1

Reference no: EM131615507

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