If a hat contains slips of paper numbered 1-10, what is the probability of pulling a 5 on your ...

If a hat contains slips of paper numbered 1-10, what is the probability of pulling a 5
  on your first attempt?
 
  a. 0
  b. .1
  c. .5
  d. 1

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If a social worker conducting a research study utilizes two or more sources of evidence to
  confirm conclusions, he/she is using what type of strategy for rigor?
 
  a. Trustworthiness
  b. Triangulation
  c. Reflexivity
  d. Prolonged Engagement

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When calculating the probability of pulling one of ten names out of a hat, the
  denominator is the __________.
 
  a. number of attempts
  b. number of names
  c. number of attempts multiplied by number of names
  d. number of attempts divided by number of names