Let’s say that the price for a monthly cell phone plan in the US follows a normal distribution with a mean of $62 with a standard deviation of $18. Calculate the z-score for the cost of your cell phone plan. Then write a few complete sentences to describe:

• What proportion of cell phone plans are below your cost?
• What proportion of cell phone plans are above your cost?
• Is your cell phone plan considered unusually expensive or inexpensive? (Hint: find the middle 90% of observations)

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