1. Joshua investigated variation in his class. He looked at people's thumbs. He found out that some people have straight thumbs and some people have hitchhiker's thumbs. Look at Figures 13 and 14 . He did a survey and found that of the 45 learners in the class 39 had straight thumbs and six had hitchhiker's thumbs. a) Calculate the percentage of learners in the thumb. Show your working.

To calculate the percentage of learners with straight thumbs and hitchhiker's thumbs, you can use the formula: Percentage = (Number of individuals in that category / Total number of individuals) × 100. For straight thumbs: Percentage of straight thumbs = (39 / 45) × 100 = 86.67%. For hitchhiker's thumbs: Percentage of hitchhiker's thumbs = (6 / 45) × 100 = 13.33%. So, approximately 86.67% of the learners have straight thumbs while about 13.33% have hitchhiker's thumbs.