Reply With QuoteKaren,
A is correct.
For B, "exactly 1" and "at most 1" aren't complements.
"at most 1" is the same as "zero OR one" also written as "zero + one" so you need to find P( j = zero ), using the same method as in A, then add it to your answer in A.
John
I actually figured this one out ( it took 15 minutes, which is good for me) but need to clarify the answer as the text does not provide it!
The probability that a person has immunity to a particular disease is 0.1. Randomly select 5 people from the population. Find the probability that among the 5 people selected:
a) exactly 1 person have immunity to the disease
b) at most 1 person have immunity to the disease.
For "A" I use n = 5, p=0.1 and j= 1
using the nCjpj(1-p)n-j formula I worked it out to be .33
For"B" I used 1 - .33
Am I correct?
Karen,
A is correct.
For B, "exactly 1" and "at most 1" aren't complements.
"at most 1" is the same as "zero OR one" also written as "zero + one" so you need to find P( j = zero ), using the same method as in A, then add it to your answer in A.
John
It makes sense now! thank you.
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