Probability that among 5 randomly chosen people no-one is left-handed, is less than 0.5

Probability that among 3 randomly chosen people there is exactly 1 who is left-handed, is 0.243.

Probability that among 5 randomly chosen people at least one is left-handed, is less than 0.5

The number of left-handed people in a group of 20, is approximately normally distributed