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The mean weight of 500 college students is 70 kg and the standard deviation is 3 kg. Assuming that the weight is normally distributed, determine how many students weigh exactly 64 kg.
- B. 5
- C. 10
- D. 15
Correct Answer: A
Rationale: In a continuous normal distribution, the probability of an exact value (e.g., P(X=64)) is 0, as probability is measured over intervals, not points. Thus, 0 students, as per the document.
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A 22-year-old patient calls the clinic and tells the nurse that she has been depressed and is thinking about taking St. John's wort but wants to know if it is safe first. The nurse begins by questioning what other medications the patient takes and would be concerned about a drug-alternative drug interaction if the patient is also taking what type of medication?
- A. Antihistamines
- B. Analgesics
- C. Antibiotics
- D. Oral contraceptives
Correct Answer: D
Rationale: St. John's wort can interact with oral contraceptives that alter drug metabolism, which can decrease the effectiveness of the contraceptive. Analgesics, antibiotics, and antihistamines can be taken in combination with St. John's wort without known adverse effects.
The safest drug to use to treat pregnant women with deep vein thrombosis is:
- A. Low-molecular-weight heparin
- B. Warfarin
- C. Aspirin
- D. Heparin
Correct Answer: D
Rationale: Heparin is safest in pregnancy as it doesn't cross the placenta, unlike warfarin (B, teratogenic); LMWH is also safe but not listed as 'heparin.'
When documenting, which of the following would be appropriate for the nurse to use at accredited health care organizations? Select one that does not apply.
- A. IU
- B. 2mg
- C. 0.2 mg
- D. Units
Correct Answer: A
Rationale: Always use a leading zero when writing decimals (i.e., 0.2 mg, not .2 mg) and leave off the trailing zero (i.e., 2 mg, not 2.0 mg). Always write out units, international units, and daily; do not use U, IU, or QD.
Beta blockers are the drugs of choice for exertional angina because they:
- A. Improve myocardial oxygen supply by vasodilating the coronary arteries
- B. Decrease myocardial oxygen demand by decreasing heart rate and vascular resistance
- C. Both 1 and 2
- D. Neither 1 nor 2
Correct Answer: B
Rationale: Beta blockers reduce oxygen demand by lowering heart rate and resistance, not by vasodilation.
Reduce the likelihood of therapeutic failure with tamoxifen treatment
- A. Not provided in document
- B. Not provided in document
- C. Not provided in document
- D. Not provided in document
Correct Answer: B
Rationale: This question lacks options, but the answer key (ANS: 2) suggests the second choice. Strategies to reduce therapeutic failure include avoiding CYP2D6 inhibitors to ensure proper metabolism of tamoxifen to its active form.