In a poll of 500,000 people, if the occurrence of very wealthy people is 3 out of every 10,000, what is the probability that there exists between 150 to 152 (inclusive) very wealthy people among the 500,000?

Question

anonymous · Answer

Can we use normal distribution ?

lgbasallote · Answer

i doubt....but let me see....

lgbasallote · Answer

^by that i meant show me your proposed solution...

anonymous · Answer

n=500,000 , p =3/10,000 , q= 1-p
Now,
Mean = np = 150
Standard deviation = (npq)^1/2 = 12.2456
Then,
P(150<=X<=152)
P((150-150)/12.2456 <=z<=(152-150)/12.2456)
P(0<=z<=0.1633)
P(z<=0.1633) - P(z<=0)

lgbasallote · Answer

hmm...i don't think that's applicable...

lgbasallote · Answer

this is actually a poisson distribution

lgbasallote · Answer

i suppose no one knows what it is.....