Suppose a Healthy Handwashing Survey is conducted and it was found that 65% of adult Americans operate the flusher of toilets in public restrooms with their foot. Suppose a random sample of 21 adult Americans is obtained and the number who flush public toilets with their foot is recorded.
Use three decimal places for the following questions. If 21 adult Americans is randomly selected, find the probability that
d. Between 13 and 16 (including 13 and 16) people flush public toilets with their foot.