30% of the population has brown eyes. Suppose a group of 20 people is randomly selected and their eye color is recorded as either "brown" or "other". a) For such a group, find the mean number of people who have brown eyes.

b) For such a group, find the standard deviation of the number of people who have brown eyes, rounded to the first decimal place.

c) In one such group, is 11 an unusually high number of people who have brown eyes? Explain.