Test your'self 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.

Let's break down the problem step by step. ### Known Conditions: 1. Total number of learners in the class: \( T = 45 \) 2. Number of learners with straight thumbs: \( S = 39 \) 3. Number of learners with hitchhiker's thumbs: \( H = 6 \) ### Step 1: Verify the Total To ensure the data is consistent, we can check if the sum of learners with straight thumbs and hitchhiker's thumbs equals the total number of learners. \[ S + H = 39 + 6 \] ### Step 2: Calculate the Total Now, let's perform the calculation: \[ S + H = 39 + 6 = 45 \] ### Conclusion The total number of learners with straight thumbs and hitchhiker's thumbs is indeed equal to the total number of learners in the class, confirming that the data is consistent. If you have any specific questions or need further analysis regarding this survey, please let me know!