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SAT Math Practice Question #13861 - SATify | SATify

#13861

data analysis

probability

hard

45 sec

A medical study recorded blood types and rhesus factor for a sample group as shown:

Rhesus factor	A	B	AB	O
+	20	15	5	10
−	8	3	2	x

If one person from this group who is rhesus negative is chosen at random, the probability that they have blood type B is $\frac{1}{6}$ . What is $x$ ?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.