A Laboratory Worker Finds That 1

A laboratory worker finds that 1.8% of his blood samples test positive for the HIV virus.If 270 blood samples are selected at random,is it appropriate to use a Normal model to approximate the distribution of the number that test positive for the HIV virus?

A) Yes; Normal model with μ = 4.86 and σ = 4.77 can be used to approximate the distribution.
B) No; Normal model cannot be used to approximate the distribution because nq < 10.
C) Yes; Normal model with μ = 4.86 and σ = 2.18 can be used to approximate the distribution.
D) No; Normal model cannot be used to approximate the distribution because np < 10.
E) Yes; Normal model with μ = 265.14 and σ = 2.18 can be used to approximate the distribution.

Correct Answer:

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