help please

0.1 0.1 0.05 0.05 4 0 2 3 5 2 3 5 7 8 O O (b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (Round your standard deviation to two decimal places.) friends friends (c) What is the smallest number of names would you have to submit to be at least 96% sure that at least two addresses will be found? (Enter your answer as a whole number.) names