# Question

The prices of all college textbooks follow a bell-shaped distribution 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.

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.

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