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A recent study done by the National Retail Federation found that 2021 back-to-school spending for all US households who have school-aged children follows a Normal

A recent study done by the National Retail Federation found that 2021 back-to-school spending for all US households who have school-aged children follows a Normal distribution with mean $753 and a standard deviation $108. Use this information to answer the following questions.

a. What is the value of the IQR for the distribution of 2021 back-to-school spending for a US household with school-aged children?

b. What is the proportion of US households with a back to school spending between Q1 and Q3?

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