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Which of the following is a binomial experiment?

A sales representative makes 6 cold calls in a day. The probability of successfully making a sale on any given call is 40%. Find the probability of making a sale on all 6 calls.

National surveys indicate that 36% of people have been in a car accident in the last 5 years. If you randomly sample 10 people, how likely is that exactly 4 have had an accident in the last 5 years?

Based on historical weather data in a certain city, about 62% of the days are cloudy. Find the mean, standard deviation, and variance for the number of cloudy days in a 30-day month.