The prices of all college textbooks follow a bell-shaped distribution with a mean of $180 and a

Question:

The prices of all college textbooks follow a bell-shaped with a mean of $180 and a standard deviation of $30.
a. Using the empirical rule, find the percentage of all college textbooks with their prices between
i. $150 and $210
ii. $120 and $240
b. Using the empirical rule, find the interval that contains the prices of 99.7% of college textbooks.
Distribution
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