e1s2kat26
2020-12-09
A random sample of 88 U.S. 11th- and 12th-graders was selected. The two-way table summarizes the gender of the students and their response to the question "Do you have allergies?" Suppose we choose a student from this group at random.
What is the probability that the student is female or has allergies?
(b)
(c)
(d)
Aniqa O'Neill
Skilled2020-12-10Added 100 answers
DEFINITIONS
Complement rule
General addition rule for any two events:
SOLUTION
We note that the table contains information about 88 peoples (given in the bottom right corner of the table).
Moreover, 34 of the 88 people have allergies, becatise 34 is mentioned in the row Yes” and in the column *Total” of the table.
The probability is the number of favorable outcomes divided by the number of possible outcomes:
Use the general addition rule:
Result:
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