A researcher conducted a study of effects of taking a supplement once a day during lunch on cholesterol levels of elderly people at a nursing home. sample is made up of 38 male participants & 56 female participants. distribution of the ages of all participants in study: Age Range, Number of Participants: 70 – 74, 12; 75 – 79, 37; 80 – 84, 37; 85 and older, 8; Total 94. number of participants younger than 75 years old in study is what percent greater than number of participants 85 years or older?

There’s a lot of information given to you in the question that you don’t need. All you’re asked is to compare two numbers–the number of participants under 75 years old (12 people) and the number of participants 85 years or older (8 people). So, 12 is what percent greater than 8?

The words “percent greater” tell you this is percent change question. So we calculate the change (I.e., the difference) between the two numbers, and then we divide by the starting number (in this case, 8).

The question asked for this in percent form, so we’re looking for 50%.