SOLUTION: forty-five percent of households say they would feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,

Algebra ->  Probability-and-statistics -> SOLUTION: forty-five percent of households say they would feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,      Log On


   

Question 991702: forty-five percent of households say they would feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings. Find the probability that the number that they say they would feel secure is (a) exactly five, (b) more than five, (c) at most five
I was able to get {A} which I think is .172 but I cant get the last two parts.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
(b) Compute the following probabilities below

Exactly 6 people feel secure
Exactly 7 people feel secure
Exactly 8 people feel secure

For each piece, you would use the same idea you did in part (a) when you did "exactly 5"

Then add up the three probabilities to get the answer.

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(c) "At most 5" means "everything below 5, including 5 itself, added up"

Compute the following probabilities

Exactly 1 person feels secure
Exactly 2 people feel secure
Exactly 3 people feel secure
Exactly 4 people feel secure
Exactly 5 people feel secure (already done in part (a))

Then add up the probabilities to get your answer