visited a dentist in the last five years Suppose you ask 50 adults selected at r

Question

visited a dentist in the last five years Suppose you ask 50 adults selected at random if they have visited a dentist in the last five years Can a normal distribution be used to appraximale the dstrbuto the random variable x that counts the number of aduts who have visited a dentist in the last five years? Choose the corect answer below O A. No since nq e 6, the normal distrbution should not be used O B Yes; sinoe no e5 and nq *&, the normal distrbution can be und O C. Yes since np a 6 and no a 6, the nomal distribution can be used O D. No since np

Explanation / Answer

Sol:

n=50

p=prob of succss=95%=0.95

q=1-p=1-0.95=0.05

np=50*0.95=47.5>=5

nq=50*0.05=2.5<5if nq also >5 we can use normal distribution, but here nq<5

we cannot use normal distribution

normal distribution cannot be used since nq<5

MARK OPTION A

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