SOLUTION: Use a normal approximation to find the probability of the indicated number of
voters. In this case, assume that 103 eligible voters aged 18-24 are randomly
selected. Suppos
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-> SOLUTION: Use a normal approximation to find the probability of the indicated number of
voters. In this case, assume that 103 eligible voters aged 18-24 are randomly
selected. Suppos
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Question 1154134: Use a normal approximation to find the probability of the indicated number of
voters. In this case, assume that 103 eligible voters aged 18-24 are randomly
selected. Suppose a previous study showed that among eligible voters aged 18-24,
22% of them voted.
Probability that exactly 28 voted
You can put this solution on YOUR website! Use a normal approximation to find the probability of the indicated number of
voters. In this case, assume that 103 eligible voters aged 18-24 are randomly
selected. Suppose a previous study showed that among eligible voters aged 18-24,
22% of them voted.
Probability that exactly 28 voted
The desired approximation is the probability that x lies between 27.5 and 28.5,
using those values of the mean and standard deviation.
Get the z-scores for those two values and we find that it equals:
That gives 0.4177-0.3749 = 0.0428
The TI-83 or TI-84 calculator gives a more accurate answer than can
be gotten through tables. They both round to 0.04. So 4% is about
as close as you're going to get.
Edwin
