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.

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UpStudy AI · Accepted Answer

To calculate the percentage of learners in the class with straight thumbs, we can use the formula:

$$ \text{Percentage} = \frac{\text{Number of learners with straight thumbs}}{\text{Total number of learners}} \times 100\% $$

Given:
- Number of learners with straight thumbs = 39
- Total number of learners = 45

Substitute the values into the formula:

$$ \text{Percentage} = \frac{39}{45} \times 100\% $$

Now, we can calculate the percentage.
Calculate the value by following steps:
- step0: Calculate:
  $$\frac{39}{45}$$
- step1: Reduce the fraction:
  $$\frac{13}{15}$$
The percentage of learners in the class with straight thumbs is $$0.8\dot{6}$$ or $$\frac{13}{15}$$ when expressed as a decimal or fraction, respectively.
The percentage of learners with straight thumbs is approximately 86.67%.

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