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2.Consider the built-in USArrests data frame. (a) Determine the number of rows and columns for this data frame. (b) Calculate the median of each column of this data frame. (c) Change the row name (full name of the state) to its abbreviation (e.g. Alabama to AL, Michigan to MI). (d) Find the average per capita murder rate (Murder) in regions where the percentage of the population living in urban areas (UrbanPop) exceeds 77%. (e) Compare (d) with the average per capita murder rate where urban area population is less than 50%

2.Consider the built-in USArrests data frame. (a) Determine the number of rows and columns for this data frame. (b) Calculate the median of each column of this data frame. (c) Change the row name (full name of the state) to its abbreviation (e.g. Alabama to AL, Michigan to MI). (d) Find the average per capita murder rate (Murder) in regions where the percentage of the population living in urban areas (UrbanPop) exceeds 77%. (e) Compare (d) with the average per capita murder rate where urban area population is less than 50%

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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2.Consider the built-in USArrests data frame.
(a) Determine the number of rows and columns for this data frame.
(b) Calculate the median of each column of this data frame.
(c) Change the row name (full name of the state) to its abbreviation (e.g. Alabama to AL,
Michigan to MI).
(d) Find the average per capita murder rate (Murder) in regions where the percentage of
the population living in urban areas (UrbanPop) exceeds 77%.
(e) Compare (d) with the average per capita murder rate where urban area population is
less than 50%

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