Assume that 10% of people are left-handed. Suppose 10 people are selected at random. 

a) Find the mean and standard deviation of the number of right-handers in the group.

μ= ? right-handers

σ= ? right-handers

(Round to two decimal places as needed.)

b) What's the probability that they're not all right-handed? (Round to three decimal places as needed.)

c) What's the probability that there are no more than 9 righties? (Round to three decimal places as needed.)

d) What's the probability that there are exactly 5 of each? (Round to five decimal places as needed.)

e) What's the probability that the majority is right-handed? (Round to three decimal places as needed.)