which of the following are random samples? a. surveying people standing outside a single grocery store. b…

Brief Explanations:

A random sample is one where every member of the population has an equal chance of being selected. In option A, people outside a single grocery - store may have certain characteristics (e.g., living nearby), so it's not random. In option B, choosing every 5th person from a list of all students in the school gives each student an equal chance of being selected. In option C, randomly selecting cities and then surveying residents gives residents across the country a chance of being selected. In option D, asking only friends is a biased sample as friends may have similar characteristics and opinions.

Answer:

B. Choosing every 5th person from a list of all students in the school. C. Surveying residents in randomly selected cities across the country.