# The average selling price of BlackBerry smartphones purchased by a random sample of 35 customers was $311.

## Question:

The average selling price of BlackBerry smartphones purchased by a random sample of 35 customers was $311.

Assume the population standard deviation was $35.

**a.** Construct a 90% confidence interval to estimate the average selling price in the population with this sample.

**b.** What is the margin of error for this interval?

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