To study the perceptions of waiting time, a researcher conducted a survey of 100 prospective passengers at bus stops. Their answers revealed a mean of 5.2 minutes with standard deviation 1.2. Construct a 90% confidence interval for the true mean waiting time.

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A: Given data: Science Math 85 120 76 85 73 73 80 70 72 80 84 34 79 72

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Q: What is the area under the normal curve at the right of z = -1.20?

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Q: For the standard normal distribution shown on the right, find the probability of z occurring in the…

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