The chance of getting a particular disease sometime during your lifetime is estimated at 1 in 20.

Smoking increases the risk of developing the disease during your lifetime by 20%.
How many people out of a group of 1000 smokers would you expect to get the disease sometime during their lifetime?

risk of developing the disease for general public = 1/20

rink of developing the disease for smokers
= (1/2)(1.2) = .06 = 3/5

So from 1000 appr. 60 would develop the disease.

To calculate the number of people out of a group of 1000 smokers who would be expected to get the disease sometime during their lifetime, we need to consider the overall chance of getting the disease and the increased risk due to smoking.

1. Calculate the overall chance of getting the disease:
The chance of getting the disease sometime during your lifetime is estimated at 1 in 20. This can be expressed as a probability of 1/20 or 0.05.

2. Calculate the increased risk due to smoking:
Smoking increases the risk of developing the disease during your lifetime by 20%. This means that the original probability of 0.05 will increase by 20%. To calculate the new probability, we need to multiply the original probability by (1 + 0.20).

New probability = 0.05 * (1 + 0.20) = 0.05 * 1.20 = 0.06.

3. Calculate the expected number of people out of a group of 1000 smokers:
To determine the expected number of people who would get the disease, we can multiply the new probability by the total number of smokers in the group (1000).

Expected number of people = 0.06 * 1000 = 60.

Therefore, you would expect approximately 60 people out of a group of 1000 smokers to get the disease sometime during their lifetime.