Approximately 15% of the population is left-handed. Assume that a sample of 200 people is selected and the sample proportion p , of left-handed individuals is calculated.

a) Find the mean p and standard deviation p of the sample proportion p .

b) Find the probability that the sample proportion is less than 0.1.

c) Find the probability that the sample proportion is between 0.1 and 0.2.

d) Find the probability that the sample proportion is more than 0.18

Example 8.5