Are there supposed to be datasets for questions like these, or do the questions provide enough info to know the answer?

Refer to the State of Cybersecurity (2019) survey of firms from around the world, Exercise 1.20 (p.27). Of the 1,576 firms that responded to the survey, 1,260 (or 80%) expect to experience a cyberattack (e.g., a Malware, hacking, or phishing attack) during the year. Estimate the probability of an expected cyberattack at a firm during the year with a 90% confidence interval. Explain how 90% is used as a measure of reliability for the interval.