Question 1000028: Psychologists estimate that 80% of male drivers, when lost in trying to find
a location, continue to drive rather than asking for directions. If this
estimate is correct, what is the probability that, in a random sample of 100
lost male drivers, the proportion who continue to drive is
a. at least 0.70?
b. less than 0.85?
I just want which formula I should use . please tell me step by step not shortcut method . great thanks
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Psychologists estimate that 80% of male drivers, when lost in trying to find
a location, continue to drive rather than asking for directions. If this
estimate is correct, what is the probability that, in a random sample of 100
lost male drivers, the proportion who continue to drive is
Binomial Problem:: n = 100, P(lost driver drives) = 0.8
======================
a. at least 0.70?
P(70<= x <=100) = 1 - binomcdf(100,0.8,69) = 0.0061
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b. less than 0.85?
P(0<= x <=85) = binomcdf(100,0.8,85) = 0.9196
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Cheers,
Stan H.
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