After a campaign to encourage students to take precautions against skin cancer,

Question

After a campaign to encourage students to take precautions against skin cancer, in a certain high school class consisting of 30 girls and 24 boys, it is observed that 22 girls and 17 boys take precautions as measured by a survey to elicit how often they wear sunscreen, sunglasses and hats for protection against the sun.

Please use this information to calculate the probabilities for the following questions. Please provide each numerical answer to TWO DECIMAL places (X.XX) with no additional information in the answer box. Just X.XX (i.e. no extra spaces, no units, etc).

What is the probability that a student picked at random takes precautions against skin cancer (by wearing sunscreen, sunglasses and a hat)?

Explanation / Answer

total number of students = 30+ 24 = 54

number of students who take precaution against skin cancer (by wearing sunscreen, sunglasses and a hat) = 22+17 = 39

hence the probability that a student picked at random takes precautions against skin cancer (by wearing sunscreen, sunglasses and a hat) = 39/54 = 0.72222

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