Find Probability (No Headache Or Took Medicine). State your answer as a reduced fraction

Question

Headache and took medicine- 11 people

Headache and did not take medicine- 13 people

No headache and took medicine- 54 people

No headache and did not take medicine- 22 people

Answer 1

You've got 4 categories, and you need the probability of "no headache" OR "took medicine"--this means the likelihood that a given case fits at least one of those descriptors. Express your answer as a fraction. The denominator will be the total number of people, or 100. The numerator will be (n 'people who took medicine' + n 'people with no headache.')

If possible, simplify the fraction.