Final answer:
While the references provided discuss the digital divide and Internet access disparities, they do not include the specific statistic for Internet access in Cuba. Thus, we cannot determine the percentage of Cuban citizens with Internet access at home from the materials provided.
Step-by-step explanation:
The specified case study, "IT's About Business 1.3", likely provides specific information regarding Internet access in Cuba; however, the provided reference material does not contain a direct statistic for Cuba. Therefore, based on the materials given, it is not possible to accurately answer the question regarding the percentage of Cuba's citizens with Internet access at home without additional context or information. Notably, the reference materials discuss aspects of the digital divide in different contexts, including disparities in access among rural and urban areas, income levels, and racial groups within the United States, rather than Cuba. The focus is on the challenges and changes in Internet access affecting various demographic groups, and the reference to Cuba within these materials is limited to its economic transition, without specifics on Internet connectivity.