Question

julie created an app. she noticed that 10% of the users who downloaded her app upgraded within a week. let x be the number of customers who downloaded the app within a week. assuming the probability that each users upgrades are independent, what type of variable is x?
binomial
neither
random
geometric

Explanation:

A binomial variable has a fixed number of independent trials (number of users downloading the app), two possible outcomes (upgrade or not upgrade), and a constant probability of success (10% upgrade probability). Here, \(x\) represents the number of successes in a fixed - number of independent trials. A random variable is a more general term, and the situation doesn't match the criteria for a geometric variable (which waits for the first success).

Answer:

A. binomial