Use a normal approximation to find the probability of the indicated number of voters. In this case assume that 150 eligible vote
rs aged 18-24 are randomly selected. Suppose a previous study showed that among eligible voters aged 18-24, 22% of them voted. The probability that fewer than 39 of 150 eligible voters voted is
The number of people who voted follows a binomial distribution with probability of having voted and subjects, which means the approximating normal distribution should have mean and standard deviation .