City records indicate that the average age of the houses on the west side of town is 43 years, with standard deviation 23 years. These records also indicate that 30% of west-side houses are made of brick. A construction company plans to send an advertising brochure to 196 randomly selected west-side houses.
Use a normal curve to estimate the probability that the average age of the houses receiving the brochure is greater than 45 years.